Driveline issue...Jeep bouncing

[hickman785]

I have a 2020 Gladiator Sport S with the max tow package

From March 2020 until March 2021 it rode great, no issues at all. In March 21 I had about 600 pounds on the back of the truck(overland build), all factory suspension except for a Terflex spacer leveling kit and air bags. One day in March 21, the truck just started bouncing. Nothing happened, it just started doing it.

Here is a timeline of what Ive bene through with this truck:

1. First I added some Rubicon factory shocks and nothing changed.
2. Next I added Falcon 3.3 shocks and a Hellwig rear sway. Nothing changed.
3. I removed my RTT and awnings(about 225 pounds), nothing changed.
4. Changed the tires from Falcon AT3Ws standard load to KO2 load range C, nothing changed.
5. Added a Clayton 2.5" ride right kit, nothing changed.
6. A local 4x4 shop added a driveshaft carrier bearing and a set of factory wheels and tires, nothing changed. They stated it is a driveline issue and referred me to a dealership.
7. My local dealership put the truck on a lift and could feel the bounce with it lifted completely off the ground(axles unsupported). I also observed the driver side rear tire wobbling while it was on the lift. The dealership added another set of wheels and tires on it and changed both rear axles and the driveshaft, nothing changed.
8. Jeep had me remove all of the weight on the back of the truck and a Jeep "engineer"(he was actually an engineer of being a dumbass) came in and checked the truck. That was dead end. He stated it was not bouncing at all even though the dealership said it was and it bounced all the way to the dealer and all the way home. As a result of removing the weight, the bouncing was reduced but it did not go away completely.
9. I removed all of the Clayton equipment from the rear end and put it back to factory. The harsh ride improved but the bouncing did not.

One crazy thing that makes no sense is that with lower tire pressures(anything below 34 pounds) will mave ake the bouncing a million times worse. I usually run with about 40 pounds per tire, which of cource makes the ride pretty harsh.

I recenlty added a set of Icon triple rate rear springs to help with the harshness. They helped, butu now the bouncing is worse.(I assume because the Icon springs are softer that the factory max tow springs).

I've called about 15 4x4 shops around the country and the truck has been in five different shops in the middle TN area and so far no one has had an answer. I also tried to get the truck replaced under TN lemon law( I meet all of the requirements and then some) and was turned down three times with no explanantion. I was told to hire an attorney if I wanted an answer as to why they keep saying no.

Does anyone have any clue as to what may be wrong with my truck? My opinion is that the entire rear axle assmebly from hub to hub, including the rear differential, needs to be replaced and not just the inner axle shafts but the dealership refused to do that.

I am open to any advice or suggestions at this point, outside of hire an attorney or get rid of the truck.(All lawyers refuse to help me and I refuse to get ripped off in the current car market)

****I apologize, but somehow I left out some of the most important details of what I'm experiencing with my Jeep. The bouncing starts around 35 mph, gets much worse at 40 mph, and goes away around 50 mph. I can drive around at 30 mph and barely feel it bounce. On some roads, such as concrete interstates, the bouncing starts immediately(Im already up to speed, past 50 mph when I get on these roads) and it continues until I exit that road.

When my truck was weighted down, it bounced the worst at 35 mph, since I took the weight off, the speed has changed to 40 mph.

So a couple of updates. Yesterday I had to replace my tires, again, for the second time in less than three years. My KO2s had less than 25k miles on them and were wearing improperly...cupping, inside wearing to much, uneven wear across...this was the same as the Falcon wildpeaks I had before. I got about 20k out of them, with the same wear issues.

Three days ago I towed my trailer for the first time since installing the Icon rear springs. The truck didn't bounce. The trailer was all over the place, but the Jeep didn't bounce. After unhooking the trailer, I drove the JT and the bouncing was back. It's odd that more weight directly over the rear axle made the bouncing worse, but weight behind the axle seemed to help.

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[Lunentucker]

?

 

[hickman785]

?

Trust me, that's near the top of my list of ideas...

 

[ShadowsPapa]

I have a 2020 Gladiator Sport S with the max tow package

From March 2020 until March 2021 it rode great, no issues at all. In March 21 I had about 600 pounds on the back of the truck(overland build), all factory suspension except for a Terflex spacer leveling kit and air bags. One day in March 21, the truck just started bouncing. Nothing happened, it just started doing it.

Here is a timeline of what Ive bene through with this truck:

1. First I added some Rubicon factory shocks and nothing changed.
2. Next I added Falcon 3.3 shocks and a Hellwig rear sway. Nothing changed.
3. I removed my RTT and awnings(about 225 pounds), nothing changed.
4. Changed the tires from Falcon AT3Ws standard load to KO2 load range C, nothing changed.
5. Added a Clayton 2.5" ride right kit, nothing changed.
6. A local 4x4 shop added a driveshaft carrier bearing and a set of factory wheels and tires, nothing changed. They stated it is a driveline issue and referred me to a dealership.
7. My local dealership put the truck on a lift and could feel the bounce with it lifted completely off the ground(axles unsupported). I also observed the driver side rear tire wobbling while it was on the lift. The dealership added another set of wheels and tires on it and changed both rear axles and the driveshaft, nothing changed.
8. Jeep had me remove all of the weight on the back of the truck and a Jeep "engineer"(he was actually an engineer of being a dumbass) came in and checked the truck. That was dead end. He stated it was not bouncing at all even though the dealership said it was and it bounced all the way to the dealer and all the way home. As a result of removing the weight, the bouncing was reduced but it did not go away completely.
9. I removed all of the Clayton equipment from the rear end and put it back to factory. The harsh ride improved but the bouncing did not.

One crazy thing that makes no sense is that with lower tire pressures(anything below 34 pounds) will mave ake the bouncing a million times worse. I usually run with about 40 pounds per tire, which of cource makes the ride pretty harsh.

I recenlty added a set of Icon triple rate rear springs to help with the harshness. They helped, butu now the bouncing is worse.(I assume because the Icon springs are softer that the factory max tow springs).

I've called about 15 4x4 shops around the country and the truck has been in five different shops in the middle TN area and so far no one has had an answer. I also tried to get the truck replaced under TN lemon law( I meet all of the requirements and then some) and was turned down three times with no explanantion. I was told to hire an attorney if I wanted an answer as to why they keep saying no.

Does anyone have any clue as to what may be wrong with my truck? My opinion is that the entire rear axle assmebly from hub to hub, including the rear differential, needs to be replaced and not just the inner axle shafts but the dealership refused to do that.

I am open to any advice or suggestions at this point, outside of hire an attorney or get rid of the truck.(All lawyers refuse to help me and I refuse to get ripped off in the current car market)

Not sure what you mean by bouncing - as if someone is jumping up and down in the back as you drive??
Or do you mean VIBRATION as if a tire out of balance?
Huge difference - bouncing is more like the truck going up and down like bad shocks while someone jumps up and down in the truck.
No, replacing the entire rear axle assembly won't fix "bouncing".
There are no inner axle shafts except in the front - the right axle of the front differential is split into two shafts. Maybe you just mean the axles - the "axle shafts".
There's nothing in a differential that can cause "bouncing". A pinion can be checked very easily with a dial indicator for runout - but that would be a vibration.

So, is it a VIBRATION or is the whole truck jumping up and down literally bouncing down the road as if the shocks were shot?
Vibrations are due to something spinning that is bent or out of balance.
The frequency or speed of the vibration will vary based on is it a driveshaft or a tire/axle thing.
The driveshaft spins faster so will be a quick vibration compared to a tire or wheel or axle vibration.
A driveshaft vibration can change based on acceleration or deceleration and so on.
It can be the driveshaft, carrier, or a UJOINT or similar.

 

[chorky]

Like Shadow said we need more context here.
my TJ will ’bounce’ for a few miles if I havent driven it in a while especially in summer. This is due to the tires starting to settle and get a flat spot. Oh, and the TJ has KO2 tires also. I hate them with a passion. so that would be my first thing to check. Its possible a few cables in the tire could have snapped - I have seen it before although not in a good many years.

for your axle or housing to be causing the truck to literally bounce, there would have to be some pretty nasty noises as well.

Is it truly a ’bounce’ like if your going over small speed bumps constantly? Or is it more of a jerking motion as if there were engine issues?

 

[ShadowsPapa]

Like Shadow said we need more context here.
my TJ will ’bounce’ for a few miles if I havent driven it in a while especially in summer. This is due to the tires starting to settle and get a flat spot. Oh, and the TJ has KO2 tires also. I hate them with a passion. so that would be my first thing to check. Its possible a few cables in the tire could have snapped - I have seen it before although not in a good many years.

for your axle or housing to be causing the truck to literally bounce, there would have to be some pretty nasty noises as well.

Is it truly a ’bounce’ like if your going over small speed bumps constantly? Or is it more of a jerking motion as if there were engine issues?

Good point - the tires on my WJ would cause it to "bounce" if it sat for a few weeks, or even a week or two in cold weather. It would take almost a mile for them to come out of it. They were newer decent tires, too.
My JT does it VERY VERY slightly for the first half mile after sitting 3 or 4 days in the cold. Worse if I haven't upped the pressure to compensate for the cold.


* there's surging - more of a lurching forward in a cyclic manner - a surge,
* or bouncing which is up and down as if over speed bumps over and over, or someone who weighs 400 pounds is in the back jumping up and down, for that the whole vehicle would be moving up and down - bouncing like kids in a bounce house,
* or vibrations caused by unbalanced tires, rims out of round or bent, bent or out of balance driveshafts, or bent hubs (which on modern disk brake vehicles isn't likely or you'd otherwise notice it in other ways - brake performance, for example)

Vibrations tend to resonate through a vehicle, like cause things on the dash to shake, that sort of thing.

 

[Lunentucker]

Best clue - Right rear tire "wobbling" while on a lift.

 

[hickman785]

Not sure what you mean by bouncing - as if someone is jumping up and down in the back as you drive??
Or do you mean VIBRATION as if a tire out of balance?
Huge difference - bouncing is more like the truck going up and down like bad shocks while someone jumps up and down in the truck.
No, replacing the entire rear axle assembly won't fix "bouncing".
There are no inner axle shafts except in the front - the right axle of the front differential is split into two shafts. Maybe you just mean the axles - the "axle shafts".
There's nothing in a differential that can cause "bouncing". A pinion can be checked very easily with a dial indicator for runout - but that would be a vibration.

So, is it a VIBRATION or is the whole truck jumping up and down literally bouncing down the road as if the shocks were shot?
Vibrations are due to something spinning that is bent or out of balance.
The frequency or speed of the vibration will vary based on is it a driveshaft or a tire/axle thing.
The driveshaft spins faster so will be a quick vibration compared to a tire or wheel or axle vibration.
A driveshaft vibration can change based on acceleration or deceleration and so on.
It can be the driveshaft, carrier, or a UJOINT or similar.

Imagine someone bouncing you on their knee like a baby. That's how it feels. Not rough, 100% not a vibration.

Not sure what you mean by bouncing - as if someone is jumping up and down in the back as you drive??
Or do you mean VIBRATION as if a tire out of balance?
Huge difference - bouncing is more like the truck going up and down like bad shocks while someone jumps up and down in the truck.
No, replacing the entire rear axle assembly won't fix "bouncing".
There are no inner axle shafts except in the front - the right axle of the front differential is split into two shafts. Maybe you just mean the axles - the "axle shafts".
There's nothing in a differential that can cause "bouncing". A pinion can be checked very easily with a dial indicator for runout - but that would be a vibration.

So, is it a VIBRATION or is the whole truck jumping up and down literally bouncing down the road as if the shocks were shot?
Vibrations are due to something spinning that is bent or out of balance.
The frequency or speed of the vibration will vary based on is it a driveshaft or a tire/axle thing.
The driveshaft spins faster so will be a quick vibration compared to a tire or wheel or axle vibration.
A driveshaft vibration can change based on acceleration or deceleration and so on.
It can be the driveshaft, carrier, or a UJOINT or similar.

It feels nothing like a vibration. Not saying it isn't a vibration that feels like a bounce, but it doesn't feel like one in any way. Imagine someone bouncing you on their knee like a baby. That's almost exactly how feels. When it's bouncing I look like a bobblehead. The bounce feels like something is out of balance or bent.

Somehow I completely left out one of the most important parts in my original post. I will add it next. The bouncing starts at just over 35 mph, and gets much worse at 40 mph. By the time I hit 50 mph it is almost gone completeley gone. Concrete roads are the worst regardless of speed. It bounces so hard on those it literally makes me sick to my stomach, to the point I have to get off of the road. There is also a newly paved highway in the area that is asphalt, and somehow the truck bounces the same on that road as it does on the concrete interstate, that is until I hit the older part of the road that hasn't been paved in years, then suddenly it stops bouncing.

 

[hickman785]

Best clue - Right rear tire "wobbling" while on a lift.

Thats what I told Jeep...but apparently their "engineers" don't actually have to have fully functioning brains in order to get a job with Jeep.

 

[hickman785]

Like Shadow said we need more context here.
my TJ will ’bounce’ for a few miles if I havent driven it in a while especially in summer. This is due to the tires starting to settle and get a flat spot. Oh, and the TJ has KO2 tires also. I hate them with a passion. so that would be my first thing to check. Its possible a few cables in the tire could have snapped - I have seen it before although not in a good many years.

for your axle or housing to be causing the truck to literally bounce, there would have to be some pretty nasty noises as well.

Is it truly a ’bounce’ like if your going over small speed bumps constantly? Or is it more of a jerking motion as if there were engine issues?

It definitely feels like a bounce. The only noises I've heard have been an occasional click or pop, which a few times those turned out to by the Clayton Off-road components being loose.

The constant speed bump feeling is pretty accurate. Very low profile speed bumps, just enough to know they are there. That also makes sense with the concrete roads being the worst place for the bouncing, with the constant breaks in the surface.

As far as the tires, I am going today to get new tires, but I have no doubt that the tires are not causing the bouncing. Ive had 5 different sets of wheels and tires on the truck(all while it was bouncing) and nothing changed from tire/wheel set to set.

 

[chorky]

Ok so just to clarify

• the truck suspension is now back to stock
• except for the KO2 tires however you have had multiple sets on the truck
• all gear and equipment has been removed
• dealer already replaced axles
• dealer replaced drive shaft
• left rear tire observed wobbling on lift when rotating

and it still bounces

so a couple thoughts from me, however helpful or not they are.

• See if you can take another jeep from the dealer on the same route that yours bounces. And also maybe an old beat up crappy pickup if you have access. This is just to confirm its not actually the road. Not to sound insulting but its important. There is a section of road I drive home and at first I thought my suspension was also bad because funny enough it was smoother driving my old TJ with a worn out suspension. Turns out it was the right amount of undulation to cause my new JTR to ‘bounce’
• verify with the dealer they saw no issues of concern to the hubs or axle housing when replacing the axle. Highly unlikely but it could be a potential source
• suggest the dealer take it to a body shop to make sure the frame is not bent for some reason. Highly unlikely but possible. I say this because you mention being able to watch the vehicle ‘bounce’ while on a lift with axles unsupported and wheels rotating. That tells me something is for sure out of balance or alignment. Vehicles will move somewhat while on lifts but usually not much for obvious reasons
• i would look into your state laws for lemmon vehicles. I would also contact jeep cares on this site, you can respond with quoting them and it should trigger a response. I mention this because if an engineer came out and couldnt find the problem then likely its gonna be unsolvable for some time. The fact the engineer said there was no problem though, when the dealer confirms your complaint, is odd….
  it sounds like your dealer is trying so thats good! What did they suggest next?
• if all else fails, then I would get the process started for a buy back or replacement. You already have all sorts of goodies it would be a shame to loose them.
• however a caveat is even though you removed the clayton stuff, just because they were at once on, it could cause issues with the warranty

after reading your original post again a couple more thoughts

• Tell us more about the teraflex bags. Are they still in or did you remove them?
• why did you have them in?
• did you ever overload or get close to max weight with the rig While off road?
• i would thoroughly inspect the entire frame inside and out and all welds to make sure theres no underlying frame issue.

sure hope they find the source and fix it!

 

[hickman785]

Ok so just to clarify

• the truck suspension is now back to stock
• except for the KO2 tires however you have had multiple sets on the truck
• all gear and equipment has been removed
• dealer already replaced axles
• dealer replaced drive shaft
• left rear tire observed wobbling on lift when rotating

and it still bounces

so a couple thoughts from me, however helpful or not they are.

• See if you can take another jeep from the dealer on the same route that yours bounces. And also maybe an old beat up crappy pickup if you have access. This is just to confirm its not actually the road. Not to sound insulting but its important. There is a section of road I drive home and at first I thought my suspension was also bad because funny enough it was smoother driving my old TJ with a worn out suspension. Turns out it was the right amount of undulation to cause my new JTR to ‘bounce’
• verify with the dealer they saw no issues of concern to the hubs or axle housing when replacing the axle. Highly unlikely but it could be a potential source
• suggest the dealer take it to a body shop to make sure the frame is not bent for some reason. Highly unlikely but possible. I say this because you mention being able to watch the vehicle ‘bounce’ while on a lift with axles unsupported and wheels rotating. That tells me something is for sure out of balance or alignment. Vehicles will move somewhat while on lifts but usually not much for obvious reasons
• i would look into your state laws for lemmon vehicles. I would also contact jeep cares on this site, you can respond with quoting them and it should trigger a response. I mention this because if an engineer came out and couldnt find the problem then likely its gonna be unsolvable for some time. The fact the engineer said there was no problem though, when the dealer confirms your complaint, is odd….
  it sounds like your dealer is trying so thats good! What did they suggest next?
• if all else fails, then I would get the process started for a buy back or replacement. You already have all sorts of goodies it would be a shame to loose them.
• however a caveat is even though you removed the clayton stuff, just because they were at once on, it could cause issues with the warranty

after reading your original post again a couple more thoughts

• Tell us more about the teraflex bags. Are they still in or did you remove them?
• why did you have them in?
• did you ever overload or get close to max weight with the rig While off road?
• i would thoroughly inspect the entire frame inside and out and all welds to make sure theres no underlying frame issue.

sure hope they find the source and fix it!

Ok so first of all, thank you for all of the questions. I appreciate it.

1. No the truck is not all stock at this time. Currently I have a Clayton leveling kit in the front. 2.5 springs, sway bar links, shock extensions, adjustable front track bar, factory shocks. The rear has Icon 1.5 triple rate springs, Icon sway bar links, Hellwig rear sway bar.
2. I have reinstalled my Alu Cab canopy(140 pounds), roof rack, and recovery gear inside the bed. There's about 225 pounds on the rear end. The front end has a steel bumper, winch and brush guard. About 180 pounds on the front.
3. I have been to other dealers. They either took the easy rode and blamed my aftermarket parts or just simply denied that it was bouncing at all. I drove it there(bounced all the way) they drove it(said it wasn't bouncing at all) then I drove it home(it bounces all the way home and has bounced ever since then).
4. I have driven several other vehicles on the same roads including my other Jeep(JKU) and none of them bounced at all. At one point I did consider the roads could be the issue.
5.I did speak to the dealer specifically about inspecting the hubs and axles and they said the axles that they replaced looked perfect, but they replaced them anyway.
6. TN lemon law is very simple and clear and my truck meets the lemon law requirements in more ways than one and then some, yet I was denied three times without a reason given. They refused to even tell me why they were refusing me. When I demanded to know, they told me to get a lawyer if I wanted to know why. I thought that seemed a little bit drastic just to get an answer that by law, they have to give me, but are refusing to.
7. I also tried the buyback route, but Jeep shot it down because their "engineer" who doesn't know his ass from last Tuesday, said there's nothing wrong with the Jeep and that it drives 100% as it should. He said that knowing he's lying and knowing that the dealership's service manager had already agreed there is something very wrong with my truck, not related to suspension or any aftermarket upgrade that I had done.
8. The airlift airbags are no still in. They were installed to help with rear end sag after I added the last 100 pounds to the truck in the fall of 2020. At that time I had about 600 pounds on the truck with a Teraflex leveling kit. The airbags worked and did not effect the ride quality at all. I took them out because now I only have about 225 pounds on the rear end.
9. My truck's payload is around 1700 pounds, I never had more than about 700 pounds on it plus my weight(200 ish pounds).
10. I am starting to wonder about the frame. One local shop wanted to reinforce the frame, but at the time I only had one vehicle and could not afford to leave it with them for multiple days. Now I have a 2nd Jeep and can do that, so I considering letting them try that route, depending on what it will cost.

 

[darkhorse13]

@chorky touched on it with this =

There is a section of road I drive home and at first I thought my suspension was also bad because funny enough it was smoother driving my old TJ with a worn out suspension. Turns out it was the right amount of undulation to cause my new JTR to ‘bounce’

Let me ask too, what type of road are you driving on the experience the bounce? My truck has always done this on concrete (or expansion joint roads) from about (50-60mph). Asphalt roads are never an issue. I've been in bone stock Gladiators that do the same thing. Sometimes it's just about the road surface and a "truck thing" that you can't get away from. There's a stretch of highway here in CO where both my JTR and friend's Tacomas all "buck" until you can achieve the correct speed to make it stop.

AEV always touts their "frequency tuned" springs for a front > rear balance but I've never personally ridden a JT with these to know if they control the "bounce/bucking" any better.

 

[chorky]

Ok so first of all, thank you for all of the questions. I appreciate it.

1. No the truck is not all stock at this time. Currently I have a Clayton leveling kit in the front. 2.5 springs, sway bar links, shock extensions, adjustable front track bar, factory shocks. The rear has Icon 1.5 triple rate springs, Icon sway bar links, Hellwig rear sway bar.
2. I have reinstalled my Alu Cab canopy(140 pounds), roof rack, and recovery gear inside the bed. There's about 225 pounds on the rear end. The front end has a steel bumper, winch and brush guard. About 180 pounds on the front.
3. I have been to other dealers. They either took the easy rode and blamed my aftermarket parts or just simply denied that it was bouncing at all. I drove it there(bounced all the way) they drove it(said it wasn't bouncing at all) then I drove it home(it bounces all the way home and has bounced ever since then).
4. I have driven several other vehicles on the same roads including my other Jeep(JKU) and none of them bounced at all. At one point I did consider the roads could be the issue.
5.I did speak to the dealer specifically about inspecting the hubs and axles and they said the axles that they replaced looked perfect, but they replaced them anyway.
6. TN lemon law is very simple and clear and my truck meets the lemon law requirements in more ways than one and then some, yet I was denied three times without a reason given. They refused to even tell me why they were refusing me. When I demanded to know, they told me to get a lawyer if I wanted to know why. I thought that seemed a little bit drastic just to get an answer that by law, they have to give me, but are refusing to.
7. I also tried the buyback route, but Jeep shot it down because their "engineer" who doesn't know his ass from last Tuesday, said there's nothing wrong with the Jeep and that it drives 100% as it should. He said that knowing he's lying and knowing that the dealership's service manager had already agreed there is something very wrong with my truck, not related to suspension or any aftermarket upgrade that I had done.
8. The airlift airbags are no still in. They were installed to help with rear end sag after I added the last 100 pounds to the truck in the fall of 2020. At that time I had about 600 pounds on the truck with a Teraflex leveling kit. The airbags worked and did not effect the ride quality at all. I took them out because now I only have about 225 pounds on the rear end.
9. My truck's payload is around 1700 pounds, I never had more than about 700 pounds on it plus my weight(200 ish pounds).
10. I am starting to wonder about the frame. One local shop wanted to reinforce the frame, but at the time I only had one vehicle and could not afford to leave it with them for multiple days. Now I have a 2nd Jeep and can do that, so I considering letting them try that route, depending on what it will cost.

it sounds like you have done a lot to figure this out.

i might suggest, if at all possible and now that you have a second rig, to try and return all suspension components back to stock. Yeah. Thats a MAJOR pita, but it might be necessary to prove its the vehicle and not accessories. If you do it in stages depending on component it might help pinpoint the issue. My thought here is doing that might help in a successful buy back or lemmon law approval.

I mention the frame only because you talked about some heavy weights and bags to support that. Now dont take this the wrong way because 600 pounds is hardly maxing it out but there have been A few folks who rallied their rig hard fully loaded and resulted in bending/cracking the frame. Not saying that is the case here but it seems interesting to me that it went from being fine to bouncy. Again not saying that is the case here but just trying to aid in pinpointing the cause. I cant imagine how frustrating it is!

If all else fails. Maybe see about a trade in? with this option, if the dealer says no or offers a horribly low value for trade then you can use that as ammo that something is wrong

@chorky touched on it with this =


Let me ask too, what type of road are you driving on the experience the bounce? My truck has always done this on concrete (or expansion joint roads) from about (50-60mph). Asphalt roads are never an issue. I've been in bone stock Gladiators that do the same thing. Sometimes it's just about the road surface and a "truck thing" that you can't get away from. There's a stretch of highway here in CO where both my JTR and friend's Tacomas all "buck" until you can achieve the correct speed to make it stop.

AEV always touts their "frequency tuned" springs for a front > rear balance but I've never personally ridden a JT with these to know if they control the "bounce/bucking" any better.

woah interesting. i totally missed this when looking at their lift. I wonder what the purpose is and how that is even remotely achieved.

 

[darkhorse13]

woah interesting. i totally missed this when looking at their lift. I wonder what the purpose is and how that is even remotely achieved.

Yeah, when I asked AEV about this a while back they said (paraphrasing) that they "tune" the springs so that by the time the rear end hits the same bump that the front just went over the Jeep is in "tune" to that hit as a whole (scientific explanation right?) I've had both Clayton springs and now Synergy springs and I can tell you that the same stretch of road still yields the same "bucking". Albeit, the Syngery springs are way softer and more road compliant IMO. My next endeavor (when my Falcon SP2 3.3's are done) would be trying new shocks to see if that helps. I just think that the wheelbase of both my JTR and my buddy's Taco don't play well on some of these concrete roads. I have 600lb constant load on my JTR and I thought that would've actually helped to "tame" the rear end but it obviously does not.

Again, this only happens on concrete roads and asphalt is perfectly fine.

Sorry OP, back to you

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