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Bouncy Jeep (Newb Question)

xcantuaj

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Bought my JL slightly used. Already came with 35's and 2inch lift (Mopar). I don't know much about suspension.....what upgrade will settle the jeep down and cushion the bumps.
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RMojitoJL

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Tire pressure would be the first check for sure...
 
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xcantuaj

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35's Nitto Ridge Grapplers. I believe I saw 37 psi for all 4 tires on the screen. I thought better shocks would do the job.
 

mwilk012

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The fox shocks are excellent. What do you mean by bouncy? Stiff, rough ride? Those Ridge Grapplers are likely an E rated tire, which is a bad, bad fit for the JL/JLU.
 

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wv18jl

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35's Nitto Ridge Grapplers. I believe I saw 37 psi for all 4 tires on the screen. I thought better shocks would do the job.
Are they load range E?

If so they are 10 ply one ton truck tires.
 

Swanny297

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The fox shocks are excellent. What do you mean by bouncy? Stiff, rough ride? Those Ridge Grapplers are likely an E rated tire, which is a bad, bad fit for the JL/JLU.
Aren’t a majority of 35” tires E rated? I have Ridge Grapplers on my JLU and they have been one of the best sets of ATs I have run in recent history.
 

mwilk012

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Aren’t a majority of 35” tires E rated? I have Ridge Grapplers on my JLU and they have been one of the best sets of ATs I have run in recent history.
Yep. And they are too damn thick on the sides for a Jeep. 37's are almost all E rated. You can get KO2's and Open Country M/T's in a C rating with a 315/&0R17 tire, or a wide variety of D rated tires. A few tires come in a C rating in the 35x12.50R17 size as well, but they're not usually considered great options.
 

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What does the E rated have to do with how it rides? I have the 35 ridge Grapplers with Mopar lift and it gets wobbly when I hit little bumps. Is it the kit, shocks, or the tires?
 

RMojitoJL

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Trail Grapplers in 37s are D rated... but not sure on the ridge grapplers.
 

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JoeBelt

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Just as a data point - I have a Sahara Unlimited with 18" wheels that came standard with 32" Dueler AT tires. I wanted 33" BFG KO2 which in an 18" wheel size were only available in load range E. I didn't see much of anything available for an 18" wheel from any manufacturer other than load range E. I spent a few days reading the various online feedback about the ride quality of load range E tires.

I decided to pull the trigger and can report the 275/70R18 load range E BFG KO2 tires on a Wrangler Sahara Unlimited work. I have them set at 32 PSI cold and haven't experienced any TPMS warnings. I did not experience teeth jarring ride quality and I asked the family if they noticed any difference without informing them of the new tires - they had no idea.

That being said there's going to be a huge weight difference between 33" and 37" tires. I believe the change in overall tire weight may play into the ride quality more than the actual load rating. There may be a point where things are heavy enough ride quality begins to deteriorate. Just my observation. Good luck!
 

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What does the E rated have to do with how it rides? I have the 35 ridge Grapplers with Mopar lift and it gets wobbly when I hit little bumps. Is it the kit, shocks, or the tires?
Load range C = 6 ply
Load range D =8 ply
Load range E =10 ply

E range has stiffer sidewall, can take more air for heavy loads, translates to less sidewall flex and stiffer ride for lighter vehicles.
 

CanAmMick

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I have BFG KO2’s 35x12.5R18 Load range E tires on my Sahara. I run 29-30 in the front and 28 in the rear. No problem at all with tread wear. When I purchased the Jeep new, the dealer had the air pressure set to I believe 44. It rode terrible then, and wandered all over the road at highway speed.
 

dspilman

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Yes, try lowering tire pressure see how that does. Should help some. Just don’t lower too much or you’ll get uneven tire wear.

At the end of the day you’re driving a lifted sport utility vehicle with off road tires... it’s not going to feel like Cadillac.
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