I’ll leave the more technical suspension stuff to our resident experts as they are much more qualified than me.

But in the meantime just how far down did you lower your tire pressure? I run my 35’s around 32 psi or so on the street.

Did you happen to tighten the control arms while the Jeep was on stands? If so then with the full weight of the Jeep on the ground, loosen all control arms and tighten them back up again to proper specs.
:cheers2:

 

If you went down to 40 on the tires you can go 10 more to start


Edit: From reading many forums it seems like 28 is the most common number I see for a 35-12.50-17. I run 28-30 in my 35" KO2's on a light 2dr

 

Yup, 40 is way too high, bring them down into the 30-plus range. Like I said in my post above 32 or so will be a huge improvement, try it first and see what happens.
:cheers2:

 

It's probably because of the crappy Chicago streets. I was born and raised on the South Side.

Sorry Mod. wasn't trying to bypass anything!

Mike

 

...

Sorry Mod. wasn't trying to bypass anything!

Mike

No problem, no harm. Thanks. :cheers:
:cheers2:

 

40?< My 35" never are over 27< matter of fact they run fine at 24. If i ran 40 it would bounce like a jack rabbit. What were you running before you aired down to 40, lol. I mean my 7.3 ford runs 75psi on E's but i tow 4tons as well.


most people on 35"s are running 27-29. on 15-18 rims that are from 7.5-9 wide. Now if you are the guy that runs 20" or more. Well you might be just SOL since those tires need wide rims and with a thin side wall will need to run closer to tire max specs.

 

As you can see a lot of us that run that tire size have varying opinions of what psi to run (on the street) but we all have one thing in common; we all agree that running 40 psi is a no-no which will only net you a rough ride to be sure.

You could also take it one step further and google “chalk test”. I personally don’t bother with that sort of perceived accuracy but others will probably swear by it.
:cheers2:

 

Mod, the suspension, wheels, tires and control arm were both installed by a professional shop so I'm not sure how they tightened it up the control arm.

And When I got the tires they gave it to me with 65psi which was wayyyyy to much. Then I brought it down to 45psi and it was still a rough ride. So now I got it down to 40psi and it's still rough. I'm going to bring them down to 30psi and hopefully that fixes the problem. I really hope I don't have to switch out the shocks and or springs.

 

Mod, the suspension, wheels, tires and control arm were both installed by a professional shop so I'm not sure how they tightened it up the control arm.

And When I got the tires they gave it to me with 65psi which was wayyyyy to much. Then I brought it down to 45psi and it was still a rough ride. So now I got it down to 40psi and it's still rough. I'm going to bring them down to 30psi and hopefully that fixes the problem. I really hope I don't have to switch out the shocks and or springs.

That spring and shock combo should ride comfortably for you! The air pressure adjustment is free and I would venture to guess that it helps a ton. Let usk now how it goes!

-Ryan

 

Here’s wishing you luck.

Remember too that Jeeps in general have an inherited rough ride especially lifted ones, although not to the point of misery, so don’t expect it to be too plush.
:cheers2:

 

Alright guys, so I went down to 30psi and it seems to be riding a lot better than before. I'm still feeling the bumps but I'm sure I'm never going to get it to ride like on stock suspension. So I'm just going to try this out for a little while longer and see how it feels. But the improvement is tons better. Thanks for the info guys.

 

If you (anyone) are new to the whole psi thing then it’s understandable to not to relate the tires to ride quality.

I learned the hard way many years ago (1986 CJ7 Laredo) with my brand new first ever Jeep. I always pumped up the tires (30-inch I think) to the max psi on the side wall thinking that I would gain more clearance under my Jeep while off roading. It was a CJ7 which those that don’t know rides very rough stock due to the leave springs.

Well needless to say you can just imagine the punishment that was dished out for me and my Jeep. I went like that for a couple of years until I joined a 4x4 club and noticed everyone airing down instead of up like I was.

This is embarrassing for me to share but it just goes to show that there is a lot to learn especially if you’re like I was and thought I knew everything. Live and learn.
:cheers2:

 

P.S this is what my JK looks like.

 

And this was before

 

Nice. Looks like you ditched the hood light bar.
:cheers2:

 

If the air don't get you where you want I would look for a set of shocks that have a reputation for a softer ride , Rancho 9000XLs or the new RS5000X. I don't think what you have is known for a soft ride .

 

If air pressure don't get you where you want to be look for a shock that does have a reputation of being a soft riding shock like the Rancho RS9000XL adjustable its not real cheap but none of the good parts are. The redesigned Rancho RS5000x have been getting good reviews. Sometimes the shocks that come with the off the shelf kits are just money makers for the dealer but not the nicest shocks for a good on road ride. Best to look at the BRANDS the veterens on the forums are running Vs a salesman.:cheers2:

 

If air pressure don't get you where you want to be look for a shock that does have a reputation of being a soft riding shock like the Rancho RS9000XL adjustable its not real cheap but non are the good parts.The redesigned Rancho RS5000x have been getting good reviews. Sometimes the shocks that come with the off the shelf kits are just money makers for the dealer but not the nicest shocks for a good on road ride. Best to look at the BRANDS the veterens on the forums are running Vs a salesman.:cheers2:

Thanks, I will look into this. But for right now it's riding a little more smoother. But I'll look into these :2thumbsup:

 

I have a TF 2.5" with 315/17/70 Duratracs and bilsteins. Ride was terrible because tire shop had tires at 35psi. I lowered it down to 28 cold and rides great. I then upgraded to a billstein steering stabilizer and rides perfect with no bump steer.

 

FWIW, I run my 37's at 24 psi, and use the Rancho 9000XL's. It is a very comfortable ride (vs. the standard JK)...and that is on the road.
Off-road, I air down o 10-12 psi.

The larger the tire, the lower the psi.*
i.e. My buddy runs 42's at 8 psi.

(*Certain exclusions, exemptions, and other non-sense apply. See conditions for details)