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Old 03-06-2012, 09:51 PM   #1
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Rear bumpstops positioned right?

Noticed a short time ago that my rear bumpstops were a bit angled back but didn't think much of it, that is until today wen I hit a speed bump and it felt like the rear bottomed out.
I took photos of the front and back of the same back left one but both bumpstops in the back look like this, are these normal?
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Old 03-06-2012, 10:03 PM   #2
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I would def say,no not normal.And those are the crappy Daystar bumpstops,correct?

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Old 03-06-2012, 10:13 PM   #3
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Originally Posted by 1jeeplvr
I would def say,no not normal.And those are the crappy Daystar bumpstops,correct?
Not sure about the bumpstops, they came with the jeep from the previous owner. Thanks for the help, I'll have to add those to my to do list I guess
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Old 03-06-2012, 11:09 PM   #4
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definitely not correct. that is indeed a Daystar jounce bumper, which isn't appropriate for a TJ. You need to go back to the stock jounce bumper (ZJ fronts from the junkyard will work). the bumpstop extension doesn't look appropriate to push the cup below the spacer.

regarding the angle, something is most likely broken or bent. You need to remove the rear springs, the BB spacer pucks, jounce bumper and bumpstop cups and see what is f'd up. Depending how jacked up the cup mount is, you may end up needing welding/fabrication skills to fix it. Post pictures of what you got when you get that spacer off and the springs out.
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Old 03-07-2012, 12:55 AM   #5
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Originally Posted by UnlimitedLJ04 View Post
definitely not correct. that is indeed a Daystar jounce bumper, which isn't appropriate for a TJ. You need to go back to the stock jounce bumper (ZJ fronts from the junkyard will work). the bumpstop extension doesn't look appropriate to push the cup below the spacer.

regarding the angle, something is most likely broken or bent. You need to remove the rear springs, the BB spacer pucks, jounce bumper and bumpstop cups and see what is f'd up. Depending how jacked up the cup mount is, you may end up needing welding/fabrication skills to fix it. Post pictures of what you got when you get that spacer off and the springs out.
wonderful...guess i found something to do this weekend and spend some money on thanks for the help
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Old 03-07-2012, 01:12 AM   #6
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Wait, so should I get smaller bumpstops or just take them out? or maybe even just shave these down?
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Old 03-07-2012, 05:48 AM   #7
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You will need your bumpstops to keep from bottoming out shocks and damaging them, or over compressing your springs.
The bumpstop just presses in the cup. The bolt to remove the bumpstop cup is under the bumpstop. The bumpstop cup needs to be removed to get the spring spacer off. (I do not have spring spacers in the pic below.)
The pic you provided looks like the cup is bent, or the bolt that holds it on is.
Hard to believe with a spring spacer wrapped around it. It must have taken a really big hit. Did someone jump it?
This is the only pic I could find of my rear bumpstop and cup.

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Old 03-07-2012, 06:41 AM   #8
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Maybe the bump stops weren't installed all the way in the bump stop cup. I have the same Daystar bump stops, and you can really feel them hit when you go over a speed bump or pothole. I called Daystar and they said to install them full length, and the reason other companies didn't use them is because they don't have the ability to pour polyurethane. If Daystar makes the bump stops and spacers, why don't they make bump stop extensions instead. They've been doing this for a while, and I'm sure other people have reported problems with their bump stops. I should have listened to unlimited04 and waited for the Prothane bump stop extensions to arrive. I have those and have to install them. By the way, does anyone know which stock bump stops go where? I'm thinking that the stock black ones go in front ant the yellow ones go in the rear.
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Old 03-07-2012, 08:10 AM   #9
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Quote:
Originally Posted by NorthwestTJ View Post
Wait, so should I get smaller bumpstops or just take them out? or maybe even just shave these down?
The "bumpstop" consists of three components-
1. The bump stop cup
2. The jounce bumper (the rubber thing)
3. The bump stop extension (for lifted vehicles)

With a Budget Boost, it should look like this:



That shows a 2" bumpstop extension kit, like this available from RC:
Jeep Accessories - Rear Bumpstop Extension Kit

For what it's worth, those bumpstop extensions are nothing more than Performance Accessories body lift pucks with a bolt included. You can get the pucks seperately on Amazon to save some money if you're worried about $5 here or there.

The reason those stiff poly jounce bumpers suck is because they don't serve as bumpstop extensions. The jounce bumper is SUPPOSED to fully compress into the cup.



The jounce bumper will fully compress into the cup, and in doing so it is gradually slowing down the axle as it compresses toward the frame during suspension travel. The stiff poly jounce bumpers do not do this, and they do not compress appropriately, and you cannot determine where exactly the "hard stop" is. This "hard stop" is what prevents coil damage, shock damage, suspension interferences, and other damage. I suspect the reason your stiff poly jounce bumpers are jacked up is because the suspension has overcompressed repeatedly, and the jounce bumper isn't compressing appropriately. It may have popped out to the side because they can't deal correctly with this compressing...or there could be worse damage. Take it apart and post pictures.

You can get factory type jounce bumpers from the junkyard off the front of the ZJ. TJ front, TJ rear and ZJ front's are all the same.

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Old 03-07-2012, 09:53 AM   #10
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Quote:
Originally Posted by TJDave
The pic you provided looks like the cup is bent, or the bolt that holds it on is.
Hard to believe with a spring spacer wrapped around it. It must have taken a really big hit. Did someone jump it?
This is the only pic I could find of my rear bumpstop and cup.
I hope its just the bolt thats bent. I have no idea what the guy before me did with it, but I'm gonna have to be the one to pay the consquences I guess.
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Old 03-07-2012, 09:55 AM   #11
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Quote:
Originally Posted by Arch Stanton
Maybe the bump stops weren't installed all the way in the bump stop cup. I have the same Daystar bump stops, and you can really feel them hit when you go over a speed bump or pothole. I called Daystar and they said to install them full length.
Yea when they hit you can really feel it! Maybe just because mine are messed up. I'll have to wait and see when I take it all apart.
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Old 03-07-2012, 09:57 AM   #12
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UnlimitedLJ04 thanks for the pics and link. I'll start with all that and post pictures when I do it.
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Old 03-07-2012, 06:13 PM   #13
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I have the bumpstop extensions shown in the link, haven't put them on yet because I had issues getting my springs over them so I was thinking about drilling a hole in the bottom of the spring perch and bolting them on like people have done with hockey pucks, would this work or do I need to just fight like hell to get them where they belong?
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Old 03-07-2012, 09:22 PM   #14
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Originally Posted by jrmiller View Post
I have the bumpstop extensions shown in the link, haven't put them on yet because I had issues getting my springs over them so I was thinking about drilling a hole in the bottom of the spring perch and bolting them on like people have done with hockey pucks, would this work or do I need to just fight like hell to get them where they belong?
pull the springs and install them properly.
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Old 03-07-2012, 09:24 PM   #15
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Originally Posted by UnlimitedLJ04 View Post
pull the springs and install them properly.
How much of a job is that? An hour or two?
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Old 03-07-2012, 09:29 PM   #16
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How much of a job is that? An hour or two?
yea, something like that. depends how proficient you are, how much space you have, and if you have the right tools.
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Old 03-07-2012, 10:31 PM   #17
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yea, something like that. depends how proficient you are, how much space you have, and if you have the right tools.
Thats good because I've got the right tools for it.

Should I get something like this or just a regular bump stop?
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Old 03-07-2012, 10:33 PM   #18
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Thats good because I've got the right tools for it.

Should I get something like this or just a regular bump stop?
Daystar™ - Driven by Design
I don't know what the heck those are. I know what works pretty darn good if you set it up right, which is why I recommended stock jounce bumpers like I did.
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Old 03-07-2012, 11:10 PM   #19
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They're bump stops that go over the shock itself instead I think. Just came across it when I was browsing.
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Old 03-07-2012, 11:15 PM   #20
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Originally Posted by NorthwestTJ View Post
They're bump stops that go over the shock itself instead I think. Just came across it when I was browsing.
if you're ok with beating your shocks and destroying shock mounts, then go ahead and use the shocks as bumpstops.
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Old 03-08-2012, 02:07 AM   #21
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Originally Posted by UnlimitedLJ04 View Post
if you're ok with beating your shocks and destroying shock mounts, then go ahead and use the shocks as bumpstops.
Very valid point, I already decided to go with the standard bumpstops.
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Old 03-08-2012, 08:32 AM   #22
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Any specific year of ZJ fronts?
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Old 03-08-2012, 09:05 AM   #23
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any specific year of zj fronts?
93-98

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