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Bump stops with new lift?

15K views 20 replies 5 participants last post by  Joel99TJ 
#1 ·
I am putting in my rough country 2.5 progressive lift and have noticed that my stock bump stops look worn all around the sides. It looks like they are a yellow material (looks like foam) under the black and have chipped off in places. Will they be ok? This particuliar lift does not require any adjustment of the bump stops or any mod parts. Any suggestions?
 
#2 ·
My suggestion after installing a RC 2.5" kit and the RC 3.25" kit would be to try and find some replacement bumpstops...they are pretty necessary with the shocks used on the kit...also, I would suggest cutting and removing the rubber jouncer on the shock shaft once you find new bump stops...just my personal opinion after doing so myself.
 
#4 ·
...This particuliar lift does not require any adjustment of the bump stops or any mod parts. Any suggestions?
The instructions do not mention anything about addressing the bumpstops, that does not mean they are not required...two different things.

My suggestion after installing a RC 2.5" kit and the RC 3.25" kit would be to try and find some replacement bumpstops...they are pretty necessary with the shocks used on the kit...also, I would suggest cutting and removing the rubber jouncer on the shock shaft once you find new bump stops...just my personal opinion after doing so myself.
I have to agree with AFjeepman and strongly suggest extending the bumpstops. I'm not sure of the condition of the originals, but more importantly, you need the correct length for your set-up.

I am running the RC 2.5" lift and can tell you from experience that without extending the bumpstops, you will bottom out the shocks. I had 1" extensions and still bottomed them. I now have 2" extensions in the rear and 1.5" in front. I have also removed the rubber jounce bumpers on the shocks.

See this post for some information: bumpstops, shock length, and tires size. help me iron out the fuzzy points..
 
#5 ·
I just spoke with Ryan at RC and he said the new shocks do have them built in. Also, said made necessary adjustments so the shocks are not to long.
How old is your kit ? I had mentioned to him about the concerns on this thread.
Now I am wondering if I made the right choice?
 
#7 ·
Ryan is correct about the corrected shock length, however, RC used the same shocks for the 2.5" kit and the 3.25" kit that I'm running, and that extra .75" makes a difference. You may want to have a set of their 2" rear bump stop extensions on hand in case you need them. They will work in the front as well, as far as I'm aware. the front and rear bump stops are pretty much identical.
 
#8 ·
and to follow up, the yellow "spongy" part is the bumpstop, and the rest is the mount for the bumpstop to make sure that it is at proper height for the stock suspension. It also acts as a nifty spring retainer when you upgrade your arms and can flex to the point of being able to have the springs hang loose :2thumbsup:
 
#10 ·
not really...if I was you I would put the shock on temporarily before the spring and jack that side of the axle up until the shock stops moving, and you want the bump stop to be fully compressed just before that... that yellow spongy bump stop will compress nearly all the way to the metal cup that holds it, so be sure you compensate for that as well.
 
#11 ·
I've had mine since september 09. The rear shocks I have have 2 numbers on them. Q09631/660578 they are 15-1/8" long fully compressed with the "built in bumpstop", 13-5/8" fully compressed without it. If this matches what you have, you will need extensions. I know what RC says about bumpstops, but the ones built in on the shocks will fully compress before the ones on the Jeep, causing the shocks to bottom out. I never did serious damage, but had to have them replace 1 front and 1 rear shock after 3 months.

Do what AFjeepMan said, and put the shocks on without the springs. Jack up the axle and see what you have. As stated, the stock bumpstop will compress fully into the retainer. I would definately get some extensions and have them handy.

Did you look at the post I linked earlier? There is good info there on how to measure for extensions and different solutions. Like I said in my earlier post, I put 1" extensions on when I installed the kit and still bottomed the shocks.

It's not a bad kit, my springs have held up well, the shocks are a little stiff, but overall I'm satisfied with the lift...it does what it's supposed to.
 
#13 ·
#15 ·
the nasty thing in the above pics is called the jounce bumper. its a compressible rubber "bumper" that cushions/slows the impact of the tower slamming into the spring perch.

just go to the pick-n-pull junkyard. ZJ fronts will fit in the TJ rear. and XJ fronts will fit in the TJ front. $20 tops. Last time I went, I walked out with 8 bumpers for playing with :laugh::laugh:
 
#18 ·
not if your smarter than the spring.

take some channel locks and a socket set. pull the front shocks off, leave the spring and track bar. grab the bumpstops with channel locks, wiggle them out of the cup, let them drop into the spring. remove the cup with socket set, pull that out. then squeeze the bumpstop through the spring. might need to hit it a few times with the channel lock. i assure you it fits...just takes some grunting. i pulled 8+ this way in less than 40 minutes, and that includes walking across a huge junkyard.
 
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