Chattering Noise when Accelerating Manual Transmission

[ShadowsPapa]

Same issue fellow Jeeper. Same response from two dealers. Jeep care got involved. Of course, they didn’t care. Long story short, they’re incompetent and show no initiative when trying to diagnose a vehicle. Like I said to two other post. My thoughts are for all if us with this issue and all other Jeep people to demand, protest or whatever it takes and make sure Chrysler and their engineers rectify this problem. It’s not that hard. How to do this? Idk. We just need to keep calling, complaint or whatever to Chrysler and maybe get some lawyers involved. I’m personally here soon going to have a professional driver, a jeep certified master tech, and a mechanical engineer check this out. So far I’ve had two dealerships and four different technicians tell me my shifting noise is normal! Yet, they failed to explain why it’s physically or logically doing so. One idiot tech said “there may be slack in the pinion gear.” Hahaha I laughed so hard. I said well if that was the case, my rear end would be toast by now.

Good luck - this being a chattering or "rattle" almost like a ping to some, it's not going to be easy.
"slack in pinion" that's a hoot. That's called backlash and that's a clunk - it wouldn't be toast over backlash unless very extreme, just loud -
...unless you mean the pinion BEARINGS are loose and that's loose bearings and they would be concerned about that, not dismissive.

The problem for dealers is that this appears to be with all manual transmission JTs. So they don't have anything to compare to.
And since they are at the mercy of FCA, they can't spend 4 hours trying to diagnose a noise - they won't get paid if there's no conclusion to it.
They'd have to take it to the STAR team, and a lot of them would need to do that.

On the other hand, most seem to simply have accepted it as a sound, a noise, to be ignored. It's not breaking anything, nothing is being harmed, it's just bothering some. The conditions under which it happens are limited. It's a noise.
But then, how many buy a Wrangler or Gladiator for the whisper quiet ride, superior sound systems, total lack of wind noise, and creature comforts? It's a truck. A Jeep truck at that.

But maybe you are not talking the same sound everyone else in this thread is talking? Most seem to have moved on for now since it's not breaking anything.

Looking at your anger in the crunch sound thread, sounds like you posted in this thread by mistake - this is a RATTLE similar to a ping, only during certain RPM and shifts, not all gear changes or all RPMs.
So likely it's not what this thread is about.

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[Tali Hunter]

Good luck - this being a chattering or "rattle" almost like a ping to some, it's not going to be easy.
"slack in pinion" that's a hoot. That's called backlash and that's a clunk - it wouldn't be toast over backlash unless very extreme, just loud -
...unless you mean the pinion BEARINGS are loose and that's loose bearings and they would be concerned about that, not dismissive.

The problem for dealers is that this appears to be with all manual transmission JTs. So they don't have anything to compare to.
And since they are at the mercy of FCA, they can't spend 4 hours trying to diagnose a noise - they won't get paid if there's no conclusion to it.
They'd have to take it to the STAR team, and a lot of them would need to do that.

On the other hand, most seem to simply have accepted it as a sound, a noise, to be ignored. It's not breaking anything, nothing is being harmed, it's just bothering some. The conditions under which it happens are limited. It's a noise.
But then, how many buy a Wrangler or Gladiator for the whisper quiet ride, superior sound systems, total lack of wind noise, and creature comforts? It's a truck. A Jeep truck at that.

But maybe you are not talking the same sound everyone else in this thread is talking? Most seem to have moved on for now since it's not breaking anything.

Looking at your anger in the crunch sound thread, sounds like you posted in this thread by mistake - this is a RATTLE similar to a ping, only during certain RPM and shifts, not all gear changes or all RPMs.
So likely it's not what this thread is about.

You’re right. We don’t buy these machines for quiet rides. Everyone describes noises differently. The sound is not normal. I respect your opinion though. Don’t confuse anger with frustration. Two different emotions. You sound very familiar with these drivetrians. Maybe you can give a logical explanation of why these noises are happening besides guessing? Is a guess a diagnosis? That’s like a doctor saying I think you have cancer. Oh wait it’s normal when your joints are cracking and causing pain?

 

[Tali Hunter]

You’re right. We don’t buy these machines for quiet rides. Everyone describes noises differently. The sound is not normal. I respect your opinion though. Don’t confuse anger with frustration. Two different emotions. You sound very familiar with these drivetrians. Maybe you can give a logical explanation of why these noises are happening besides guessing? Is a guess a diagnosis? That’s like a doctor saying I think you have cancer. Oh wait it’s normal when your joints are cracking and causing pain?

By the way. They diagnosed mine without even putting up in the air on a lift. They did it by test drives. Told me their theory and sent me on my way.

 

[Geoarch]

So, I'm still experiencing the "chattering", which is probably the best way to describe it. I paid more attention to it this summer and I cannot determine a rhyme or reason to it. Some days it happens, some days it doesnt. When it DOES happen, it happens consistently for that commute. It sounds, to me, like it's something in the steering column/under the wheel and it's a ressonance rattle. The only thing that's consistent about it is it's almost always most noticable at about 3,000 rpm, in 2nd gear, while accelerating. I tried to hold the rpm range and accentuate it for a video. If you turn it up, you'll hear it loud and clear at least 2 times when I'm in 2nd here. It's been an issue since the day I got the truck. 2021 Mojave 6 speed. I've had it for about 15 months and it has about 7k miles on it now.

Mine just began to rattle (about 13,000 miles). I first heard it while accelerating as with everyone else, now there is a similar rattle just driving over a bump in the road or a shitty road (most in New Mexico). My dealer said it is pretty common, and Jeep has no resolution (like the clutch issue). I love my Gladiator, but Jeep is not very supportive. Mine seems to have become worse as it got colder.

 

[Geoarch]

So gonna jump in.

Couple things I can guess here without having the issue myself. Before I even say it though, yes this is something that if covered should be fixed by a dealer, with that being said, if the person who drives the vehicle every day can’t duplicate the issue with any reliability besides some random days at random temps, but definitely this RPM, we (techs) got no chance finding it, so please don’t get mad at your dealer or techor jeep etc., we can’t make magic happen, we want to help, but if you can’t even make the noise happen yourself, we can’t chase something that currently just isn’t there.

okay, now. 1, being manual only, I’m just gonna rule out every engine related possibility, could it be that, yes, but I just don’t think that’s the issue here. What can shake vibrate from the pedal, to the master cylinder, to the bell housing, and in the clutch assembly. Only happening when clutch is engaged, no driveability change or lose of acceleration etc, we can assume we don’t have a internal clutch assembly, throw out bearing, fork or slave cylinder issue. Again, could be, but unlikely. Okay now, line, this is my most likely guess here. There’s multiple clips that hold the line, heat will change the line rigidness and minor changes in diameter. Those metal clips could allow it to rattle with just the right set of conditions. Could just bend each one just a little tighter, and without immediately being under the truck, maybe there’s a routing condition somewhere that’s too tight with not enough rigidity and may need another clamp of some kind. A key spot that this could be very possible but not sure is our issue here is up by the cowl right off the master cylinder. Older models have a quick connect fitting, that was actually part of the recall, on my 22 not sure when it started they completely changed to a thicker rubber line with hose clamps that is much better at staying still. Also just out of the bottom of the master you have the hard line, it’s held extremely close to the firewall heat shield, just minor bend in it from something at some point could cause a rattle here. The last thing is on the pedal at the top, it’s almost the same level as the steering wheel shaft (right at the pivot point for the tilt adjust) so I see where that could be the sound area people are talking about. The link that goes into the master is decently loose on the pedal mount. They changed the design in later models, I know 18 and 19 JLs where I could just tap on the link and it would come off the pedal,the one on my 22 is rock solid, so that could also be an area to inspect as well.

something that’s verrryyyyyyy helpful here is posting your build date/last 8 of your vin/Model Year. I know not everyone’s comfortable posting VINs so build date is good too. That helps track who’s effected. Only post if you are effected though or else everything gets very confusing.

Ok: 2022, Build date 16 April 2022; last 8 vin: NL145829. Mine did not begin until about 12,000 miles, and became worse when it got colder this year.

 

[Geoarch]

I just got back from a long road trip with my MT gladiator. I can now say unequivocally, the noise is coming from the pedal itself. It's the plastic vibrating.

Whenever it'd make the noise, if I'd just barely touch the pedal withy foot. It'd stop instantly. I didn't do this for very long of course, but I tried it 3 times. And it didn't even take enough pressure to slip the clutch or anything. I just barely touched the pedal with my foot, and the noise stopped. It's the pedal itself. Now, I don't know if it's due to something on the other side of the firewall touching the assembly, but it's definitely the pedal. That actually has me a lot less worried.

That's good news Chad. I'll try that next time I'm out on the road.

 

[JeepCares]

Mine just began to rattle (about 13,000 miles). I first heard it while accelerating as with everyone else, now there is a similar rattle just driving over a bump in the road or a shitty road (most in New Mexico). My dealer said it is pretty common, and Jeep has no resolution (like the clutch issue). I love my Gladiator, but Jeep is not very supportive. Mine seems to have become worse as it got colder.

Hello. If you'd like to discuss any current concerns further, please send a private message.

Kate
Jeep Cares

 

[Boxr4]

So couple things to add from me.

1.) I haven't heard my sound for months now. I did remove the clutch return spring on the pedal, Put foam padding on the top and bottom , never heard it again. Im not saying that was the issue, because seems weird that a spring that is applying pressure constantly would be able to rattle lightly, but harmonics are a fun side of physics so, might be worth looking into for y'all since the sound always went away for me barely touching the pedal, but not actually touching the master cylinder rod, oh, that was also not fully clipped in for me, I think I already mentioned that though. Any way, might be worth a check for y'all

2.) The whole Dealer story with the cams, I think his issues caused the rattle, not was the rattle, if y'all catch my drift. Also the cams snap from over torque, not under, seen more then a handful of tech think the torque wrench is not needed on 3.6's, they learn very quick. Also, the cam was worn, and they didn't replace it, or get Chrysler to pay for the LOF?? Yeah, go ahead and make another or lower your review and never go back. That's just assinine.

Has the clutch pedal noise stayed away? How much difficulty am I into to access clutch pedal return spring and modify as you indicate(any tips)? Little to no mechanical know how here/limited tools. Is this it?(pic) THX!

2022 Mojave 51000kms and this has been happening since 30k. 2nd, 3rd gear only, 3000k-4000k or so with brisk acceleration/load. Noise gone if i touch clutch pedal at all, every time.

 

[Gatorized]

Has the clutch pedal noise stayed away? How much difficulty am I into to access clutch pedal return spring and modify as you indicate(any tips)? Little to no mechanical know how here/limited tools. Is this it?(pic) THX!

2022 Mojave 51000kms and this has been happening since 30k. 2nd, 3rd gear only, 3000k-4000k or so with brisk acceleration/load. Noise gone if i touch clutch pedal at all, every time.

Easy to change that spring - push pedal to the floor,hold it down with a block wedged to the brake pedal. Reach in with your right hand and pop it out. It will have some grease on it.

se link - https://www.jeepgladiatorforum.com/...-flywheel-explained-by-act.68758/post-1144431

 

[PuddleJumper]

Good luck - this being a chattering or "rattle" almost like a ping to some, it's not going to be easy.
"slack in pinion" that's a hoot. That's called backlash and that's a clunk - it wouldn't be toast over backlash unless very extreme, just loud -
...unless you mean the pinion BEARINGS are loose and that's loose bearings and they would be concerned about that, not dismissive.

The problem for dealers is that this appears to be with all manual transmission JTs. So they don't have anything to compare to.
And since they are at the mercy of FCA, they can't spend 4 hours trying to diagnose a noise - they won't get paid if there's no conclusion to it.
They'd have to take it to the STAR team, and a lot of them would need to do that.

On the other hand, most seem to simply have accepted it as a sound, a noise, to be ignored. It's not breaking anything, nothing is being harmed, it's just bothering some. The conditions under which it happens are limited. It's a noise.
But then, how many buy a Wrangler or Gladiator for the whisper quiet ride, superior sound systems, total lack of wind noise, and creature comforts? It's a truck. A Jeep truck at that.

But maybe you are not talking the same sound everyone else in this thread is talking? Most seem to have moved on for now since it's not breaking anything.

Looking at your anger in the crunch sound thread, sounds like you posted in this thread by mistake - this is a RATTLE similar to a ping, only during certain RPM and shifts, not all gear changes or all RPMs.
So likely it's not what this thread is about.

If it makes less clunk than a CVT. I'd just ignore it as long as it functions and feel normal. Jeeps are loud anyways. If i don't wanna hear "noise", i got this fancy knob that turns up this magical thing called a radio, and it makes noise i want to hear. Its an amazing invention. ?

 

[PuddleJumper]

Hello. If you'd like to discuss any current concerns further, please send a private message.

Kate
Jeep Cares

Holy shit! I thought ya'll responding to anyone was myth! I feel like i just seen a Unicorn surfing in tighty whiteys. Might need to get my eyes and sanity checked. ?

 

[IanNubbit]

Has the clutch pedal noise stayed away? How much difficulty am I into to access clutch pedal return spring and modify as you indicate(any tips)? Little to no mechanical know how here/limited tools. Is this it?(pic) THX!

2022 Mojave 51000kms and this has been happening since 30k. 2nd, 3rd gear only, 3000k-4000k or so with brisk acceleration/load. Noise gone if i touch clutch pedal at all, every time.

So yes, but also no. I never heard the sound after I did the stated repair (no tools needed, very easy), but I have since change out the spring to a lighter one (honestly not really even worth a recommendation) and I do hear it on occasion now. Not if a coincidence or related. Eitther way, I think this continues to be an unsolved mystery. Only last real guess I have is throwout bearing noise, but the only way to verify that is by installing a hydraulic one.

 

[sceraul]

Hello! I have a 2021 Willys gladiator and experience the same resonance. I was at the dealer recently and was informed that there is a recall on my truck for a whole new clutch. They just released the parts. Now I have not driven it extensively but surely long enough for me to notice the sound and it has disappeared. Also, the clutch drives so much smoother. Not as agricultural. Hope this helps!

 

[cottonh]

I heard it on mine for the first time last week. 6MT and only while towing when I was out West. 9.5k. I will try the clutch pedal experiment next time.

 

[foggybuzzard]

I get the resonance/vibration when downshifting/decelerating. Mostly 2nd and 3rd gears

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