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Unread 07-14-2010, 06:37 PM   #1
Joel99TJ
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Bump stops with new lift?

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?

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Unread 07-14-2010, 06:50 PM   #2
AFjeepMan
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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.
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 07-14-2010, 07:11 PM   #3
johnxjeep
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Have you started yet ?
I am preparing my bolts with PB Blaster. Just courious on how it is going ?
I am wondering if I need to replace my bump stops also.
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Unread 07-14-2010, 07:15 PM   #4
MJBinNM
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Quote:
Originally Posted by Joel99TJ View Post
...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.

Quote:
Originally Posted by AFjeepMan View Post
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..
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Unread 07-14-2010, 07:20 PM   #5
johnxjeep
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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?
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Unread 07-14-2010, 07:22 PM   #6
Joel99TJ
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I did not start yet, I pb blasted everything today. I am thinking of starting tomorrow. Here is what my front drivers side looks like. What do you think? Is the black part above the yellow spongy part the actual bump stop?


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Unread 07-14-2010, 07:24 PM   #7
AFjeepMan
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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.
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 07-14-2010, 07:26 PM   #8
AFjeepMan
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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
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WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 07-14-2010, 07:28 PM   #9
johnxjeep
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Quote:
Originally Posted by AFjeepMan View Post
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.
Are they easy to install after everything is put back together ?
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Unread 07-14-2010, 07:39 PM   #10
AFjeepMan
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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.
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Relearn your priorities.[/COLOR]

WANTED: SYE and cv shaft...good condition and good price. for a TJ with about 5-6" of lift.
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Unread 07-14-2010, 08:38 PM   #11
MJBinNM
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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.
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Unread 07-14-2010, 08:55 PM   #12
Joel99TJ
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Thanks for all the info guys, so here is my rear drivers side. If I add extensions, do they go with these factory ones? This one looks pretty bad huh? Is it usable at this point?
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Unread 07-14-2010, 09:09 PM   #13
MJBinNM
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Quote:
Originally Posted by Joel99TJ View Post
Thanks for all the info guys, so here is my rear drivers side. If I add extensions, do they go with these factory ones? This one looks pretty bad huh? Is it usable at this point?
I would consider replacing them...something like these may be the best to use in front: Rubicon Express 1.5" Extended Upper Bump Stops

And these for the rear: Jeep TJ Rear Bumpstop Extension Kit With these you will need to replace the stock bumpstop also. They fit between the frame and the retainer cup.
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Unread 07-14-2010, 09:28 PM   #14
Joel99TJ
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The stock bump stops are expensive are they not?
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Unread 07-14-2010, 10:50 PM   #15
Unlimited04
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Quote:
Originally Posted by Joel99TJ View Post
The stock bump stops are expensive are they not?
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
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