Jounce Bumpers and Bump Stops

[B1Toad]

On my 2000 with stock suspension is there supposed to be jounce bumpers on top and bump stops on the perch? Checking it out I only see jounce bumpers and nothing on the perch. My front jounce bumpers are completely gone, anyone had luck squeezing new ones inside the spring and installing? If need be I could expand the spring with a twist in spring expander, or use the expanders with the all thread and notched plates.

 

[JMT]

I have tried but never done that successfully. All springs differ though, so some might have more space.

 

[06lj]

On a stock suspension you would not have any additional bump stops on the spring perch. On modified suspensions it is typical to install additional bump stops on the lower spring perch on the front and above the jounce bumper cup in the rear.
I've never attempted to squeeze a new jounce bumper through a spring but there have been several people on here who have claimed it works. The instructions were to lift the Jeep by the frame so the springs are fully decompressed. Slather the new jounce bumper with dish soap and squeeze it in. Best of luck. Report back if you are successful.

 

[B1Toad]

On a stock suspension you would not have any additional bump stops on the spring perch. On modified suspensions it is typical to install additional bump stops on the lower spring perch on the front and above the jounce bumper cup in the rear.
I've never attempted to squeeze a new jounce bumper through a spring but there have been several people on here who have claimed it works. The instructions were to lift the Jeep by the frame so the springs are fully decompressed. Slather the new jounce bumper with dish soap and squeeze it in. Best of luck. Report back if you are successful.

Thanks, will do. Any recommendations on which ones to buy?

 

[B1Toad]

I found these that install with the springs in place, just squeeze and pop in https://metalcloak.com/durospring-replacement-jounce-bumper-jeep-tj-lj.html

 

[06lj]

Thanks, will do. Any recommendations on which ones to buy?

I used the Crown replacements.
https://www.amazon.com/gp/aw/d/B00B8X7UPG?tag=wranglerorg-20

 

[OldBuzzard]

I'll claim it works, because it works. Pushing them through the spring is easy if you jacked up the frame, no lube necessary. Getting them into the cup is harder. You'll have to get it started by hand as straight as possible, and then use a prybar or wood block to press them up in. They like to get sideways. It takes me several tries, but I've got them in several times.

 

[jjvw]

I'll claim it works, because it works. Pushing them through the spring is easy if you jacked up the frame, no lube necessary. Getting them into the cup is harder. You'll have to get it started by hand as straight as possible, and then use a prybar or wood block to press them up in. They like to get sideways. It takes me several tries, but I've got them in several times.

Same. The hardest part is getting the jounces shoved up into the cup.

 

[jjvw]

Thanks, will do. Any recommendations on which ones to buy?

The yellow stock ones

 

[06TJ35's]

Thanks, will do. Any recommendations on which ones to buy?

Contact Blaine at Blackmagicbrakes.com
He might have a stock set. He sent me a set at no cost when I bought a fairlead and soft shackles.

 

[OldBuzzard]

Just remembered — the last time I did it, I stood a 2x3 on end under the jounce, and let the jack down slowly. That got it fully in with a few tries.

And if you think that jounce pad stops your axle on full compression, stick a longer 2x3 under it and see how far up into the cup you can mash it. Hint — the whole thing will essentially disappear into the cup when you get the 2x3 aligned just so. And that's a static test, imagine a tire hitting a big pothole at 70 MPH.

 

[JMT]

Same. The hardest part is getting the jounces shoved up into the cup.

How to press a jounce in the cup.

Wipe some white lithium grease on the sides of the jounce, grab a wonder bar and pry. Works like a charm. 20 seconds.

https://www.homedepot.com/p/Stanley-12-in-Wonder-Bar-Pry-Bar-55-515K/100093815

 

[06TJ35's]

How to press a jounce in the cup.

Wipe some white lithium grease on the sides of the jounce, grab a wonder bar and pry. Works like a charm. 20 seconds.

https://www.homedepot.com/p/Stanley-12-in-Wonder-Bar-Pry-Bar-55-515K/100093815

Two things I already gave. Awesome! Nice tip. Let’s just hope I remember whenever that time comes lol

 

[B1Toad]

How to press a jounce in.

Wipe some white lithium grease on the sides of the jounce, grab a wonder bar and pry. Works like a charm. 20 seconds.

https://www.homedepot.com/p/Stanley-12-in-Wonder-Bar-Pry-Bar-55-515K/100093815

That is exactly what I had in mind, I have a few Wonder bars laying around. One of them, the oldest one, has a perfect bend and it's my "go to" Wonder bar and has got me out of a lot of pinches. The newer ones are straighter and harder to work with.

 

[astjp2]

JL jounce bumpers and JK ones will fit too, found a set of those locally.

 

[B1Toad]

Did I get the orientation correct? I saw some pictures online of them installed like the new yellow one I just installed (1st pic) but looking at one of my existing rears (2nd pic) I see a small recess on the bottom side similar to the recess on the new one, so does that end with the recess go up or down?

 

[OldBuzzard]

Yes, you got it right.

Here are my OEM ones, you can see which end has been exposed to the elements, and the three little divots which help clamp it in place.

 

[06lj]

Your 1st picture is correct. The answer to your 3rd pic is yes.

 

[B1Toad]

Thanks to all. It was extremely easy to do, I popped them in between the springs with no lube and almost pressed them into the cups with my thumbs then a little nudge with the wonder bar to seat them al the way. I had the white lithium grease ready but didn't need it. I bought the Crown ones off ebay but I noticed they say made in China on them, maybe counterfeit? Prolly not, I think most everything is made in China now. Funny thing I went to buy unit bearing hubs for a Chevy van at Autozone and they had Timkens made in Mexico for $400 and Timkens made in China for $200

Anyway I have to say this TJ is the easiest vehicle I have worked on in a long time.

 

[Zorba]

How to press a jounce in the cup.

Wipe some white lithium grease on the sides of the jounce, grab a wonder bar and pry. Works like a charm. 20 seconds.

https://www.homedepot.com/p/Stanley-12-in-Wonder-Bar-Pry-Bar-55-515K/100093815

This. I used a Craftsman branded version of the same tool - used a bit of dish soap and in it went. It was harder to change out the cups (mine were rusty).