2021 Bouncy ride with Rubicon package

[Glacier1]

I haven’t seen a thread for this yet, but does anyone else have issues with the ride when you put 300 lbs or so in the bed? Mine rides like Mr Toad’s Wild Ride! Is it sprung too light or are the factory Fox shocks the issue?

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[BUZZHEAD]

Tire pressure

 

[JD101]

Tire pressure is free. But ya the factory fox shocks could use more damping especially rebound . The rears more than the fronts . When loaded it's really apparent. Replacement fox are supposed to be valved firmer .

 

[brianinca]

Freaking dealers put 40 psi in every time I used a Wave oil change, I drove my JTR off the lot at 42 PSI on the 33's. I run 31/32 on my BFG KO2's (315/70R17) and that's PLENTY when not towing. We nicknamed this Jeep Tigger because he was so bouncy at first. The difference 5 PSI makes is substantial.

I would set the OEM Falken AT's at 35 and see what happens. I run 28 psi with those tires on my YJ, probably too much.

Shocks are another matter, the Jeep OEM Fox valving is different to their standard 2.0's. Too soft for a lot of people, but not the bouncy kind of soft you're describing.

 

[Rusty PW]

Tire pressure is free. But ya the factory fox shocks could use more damping especially rebound . The rears more than the fronts . When loaded it's really apparent. Replacement fox are supposed to be valved firmer .

Yep. the rear shocks could use about 10 to 15% more rebound dampening. The front shocks could use about the same for compression dampening.

Why in the hell do all dealers put 40 psi in the tires? I have mine set to 35 front and 33 rear when empty.

 

[Rahkmalla]

Why in the hell do all dealers put 40 psi in the tires?

Do you believe in hanlon's razor?

If you do: A dealership's garage is not a brain trust, and the mechanics that are smart usually aren't doing oil changes and tire rotations. Big tire more air! (which isn't wrong, but there is a factory spec for a reason, and it's posted in a place a monkey could be trained to check)

If you don't: Overfilled tires wear out unevenly (aka quicker), and dealer's train techs to overfill tires so you need to buy yours sooner.

 

[Maximus Gladius]

I installed Air Lift 1000 to stop the bouncy, floaty ride and the side to side bobble head thing we had going on. It was a cheap fix but to do it right,….shock upgrades is needed

 

[Rusty PW]

Do you believe in hanlon's razor?

If you do: A dealership's garage is not a brain trust, and the mechanics that are smart usually aren't doing oil changes and tire rotations. Big tire more air! (which isn't wrong, but there is a factory spec for a reason, and it's posted in a place a monkey could be trained to check)

If you don't: Overfilled tires wear out unevenly (aka quicker), and dealer's train techs to overfill tires so you need to buy yours sooner.

 

[MaysvilleStig]

Yea there have been a few threads on this. It's 100% the shocks. I replaced them with Bilstein 5100's and it got rid of the bounce.

 

[Maximus Gladius]

Yea there have been a few threads on this. It's 100% the shocks. I replaced them with Bilstein 5100's and it got rid of the bounce.

I bet they did. Would love to get my hands on the bilstein 8100’s and totally customize the ride

 

[steve68]

I think the same as everyone else, bouncy and the ass end comes up on hard braking and nose dives, time for a lift!

 

[Glacier1]

If the best answer is a lift kit, what is a very good quality kit for 2 1/2” lift max? My experience in the past with lifts is buy a really good one or you will regret it later.

 

[ShadowsPapa]

Tire pressure is a different feel, not bouncy bouncy.
When I put Rubicon shocks on my Overland, I got the bouncy feel.
Tire pressure is, well, you know it when they are over-filled. You feel and hear every pebble you hit on the road. It doesn't bounce, there's nothing soft about it. You feel every pavement crack.
The bouncy is from the shocks I put on, it was a better ride, softer, better, with the stock springs and shocks but the stock springs were soft for a nice cushy ride and sagged too much when I loaded up the rear. So I put on different springs - and shocks. And when those shocks are worn out, I'm never going to replace them with the same thing. Might put by stock ones back on. Less bounce.

 

[ShadowsPapa]

Big tire more air! (which isn't wrong, but there is a factory spec for a reason, and it's posted in a place a monkey could be trained to check)

Big tire less air as there's more square inches holding the truck up. Stock H/T Overland tires have a sticker of 38 which is about right for them to wear even and ride nice.
Then a shop put TPMS sensors in some 33" Rubicon take-offs I have and forced 41 psi of air into them - you could feel it in the first block. Those tires have a bigger foot print so should take less pressure to hold up the same truck. That was TIRE SHOP.
36 was about right in them.
I called and spoke with a "customer engineer" at General and he said for the weight of my truck and the size of the General tires I put on, no more than 36 (when towing I up them of course)

It's not rocket science, it's grade school science class. Pressure working against an area = force.
More area, less pressure for the same force. (or something like that, I'm getting old and school was DECADES ago)

 

[MaysvilleStig]

If the best answer is a lift kit, what is a very good quality kit for 2 1/2” lift max? My experience in the past with lifts is buy a really good one or you will regret it later.

I don't think a lift kit is the "best" answer. The issue is the shocks and shocks alone. All springs are bouncy, they are only there to support weight, not control it. And tire pressure was explained by ShadowsPapa pretty well, so that won't solve it either. The best answer is ditch the factory Fox shocks. However you decide to do that is up to you. I recommend AEV, the 2.5in lift they offer was designed with carrying loads in mind.

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