Rear bump stop extension

[Westtown Willy]

I don't have any bump stop extensions in the rear & somehow have not destroyed anything yet though I've heard & seen my rear tire stuffed all the way up & rubbing so I've got to do something soon before I mangle more metal. My question is on placement, is it better to extend the bump stop from the top down or add spacers to the bottom. I was surfing around & came upon this though I'm not sure it's the appropriate fix for my issue. I haven't yet determined the length I'll need either, that's the next step but I figured once I opened this can of worms I'd like to be prepared to finish it quickly, & this one can be cut down to size. Will this work?

https://www.quadratec.com/products/...campaign=retargeting&utm_content=lower-funnel

 

[tworley]

Rears should be added from the top. Fronts are added to the axle spring perch.

 

[bobthetj03]

For the rear, you can get away with adding the extended bump stop to the upper cup. I would suggest against those stops you linked. Just get some washers and longer bolts.

 

[CodaMan]

Rears should be added from the top. Fronts are added to the axle spring perch.

This ^^

 

[Serbonze]

My initial response is to stay away from the Crown bumpstops. It looks like they replace the current extension, cup, and jounce bumper. I'm not sure that I would want to get rid of the jounce bumper and just have a hard piece of polyurethane as my bump stop.

I don't have experience with any other brands, but this is the one that I bought for mine.
http://www.rockkrawler.com/ProductDetails.asp?ProductCode=RK05611

 

[Westtown Willy]

My initial response is to stay away from the Crown bumpstops. It looks like they replace the current extension, cup, and jounce bumper. I'm not sure that I would want to get rid of the jounce bumper and just have a hard piece of polyurethane as my bump stop.

I don't have experience with any other brands, but this is the one that I bought for mine.
http://www.rockkrawler.com/ProductDetails.asp?ProductCode=RK05611

I wasn't really sure how they worked, I read the below statement on Crown's website & also called Quadratec, they told me that they slip into the jounce cup just like the stock one. My concern would be it popping out because it's hard material rather than the rubber stock one that I assume just smashes up into the cup. It does seem like the bump stop bolted on would be far more secure. Where did you bolt those Rock Krawler's on, because they look like they'd go on the bottom, or do they go between the bump stop & cup up top?

RT Off-Road's Extended Bump Stops prevent expensive body damage to lifted Jeep vehicles. They measure 5″ long and install in place of the factory foam bump stops. The polyurethane construction results in a longer product life and improved suspension control. They can be shortened to achieve the perfect amount of suspension articulation while still preventing the tires from contacting the body. Simple installation. Designed for vehicles with suspension lift.

 

[Serbonze]

Yea, without the jounce bumper as a cushion it’s just hard polyurethane. I don’t think that I would want that.

I installed my rears as a combination of a small upper extension (taken from a piece that I had from an existing upper front extension that was on the Jeep when I bought it) and lower RKs installed on the spring perch. With the springs removed and fully stuffed they line up just fine, and no interference with the springs installed.

 

[bobthetj03]

2" rear,
https://www.quadratec.com/products/16045_001X_PG.htm

1" rear, but with these it doesn't mention coming with longer bolts, so you'll need to get 1" longer 10mm bolts.
https://www.quadratec.com/products/16090_1119.htm

 

[bobthetj03]

You have to pull the rear springs, remove the jounce bumper, unbolt the jounce bumper retaining cup, then install the bump stop extensions.

 

[jjvw]

I've been using 2" (for the front) and 3" (for the rear) diameter plastic body lift pucks for my bump stop extension. They are cheap and can be cut to whatever length is required.

Keep the stock style soft jounces. They are designed to slow the impact of hard bump.

Add the majority of the front extension to the axle pad. If the cup is lowered too much, it can pluck the coils as they compress. The rear can be extended by lowering the cup or by adding to the axle pad. It doesn't matter. Lowering the cup is easier.

 

[k-huevo]

1" rear, but with these it doesn't mention coming with longer bolts, so you'll need to get 1" longer 10mm bolts.
https://www.quadratec.com/products/16090_1119.htm

Old Man Emu FK16 installs with the stock bolt.

 

[Westtown Willy]

2" rear,
https://www.quadratec.com/products/16045_001X_PG.htm

Thanks, that's pretty sweet for $6.99, just called Quadratec & they have them in stock in West Chester so after measuring to be sure these are long enough I'll drive over & grab them & pop them in. Rear wheels have been off all week finishing up some POR-15ing of the rear section anyway, and Fluid Filming, may as well get everything done at once.

 

[Westtown Willy]

So I pulled the old jounce bumpers out yesterday, the first one popped right out fully intact, the second one exploded into dust, managed to get most of it out in two pieces but it was toast. I was already heading to Quadratec to pick up the spacers so I added the new bumpers to the order

I'm not sure these spacers will be enough, turns out they're not 2 inches but 1.5; I really don't feel like pulling the springs to measure it all properly so I'm putting these in & I'll keep an eye on it, next time I'm up at Rausch I'll back it up the ramp & see where I am contact-wise with the tire vs. tub vs. bump stops then if needed buy another set & some longer bolts & get a full 3 inches in there. The lazy man's method. By the way the bumpers, spacers & cups all easily fit through the spaces on the rear springs so working on this has turned out far easier than anything I did on the front springs.

Thought this was interesting, the parking lot at Quadratec - count the Jeeps

Edit: by the way, if you have never been there it's not a store, it's their main warehouse but they do have a small pick up window to buy parts. I was the only customer there, all the rigs on the lot are the employees...

 

[astjp2]

Thanks, that's pretty sweet for $6.99, just called Quadratec & they have them in stock in West Chester so after measuring to be sure these are long enough I'll drive over & grab them & pop them in. Rear wheels have been off all week finishing up some POR-15ing of the rear section anyway, and Fluid Filming, may as well get everything done at once.

do these work for front and rear or just rear?

 

[Westtown Willy]

do these work for front and rear or just rear?

well they work on both but keep in mind what @jjvw said above about the front, that bump stop seems to aim down towards the axle pad on an angle going towards the spring so if you lower the cup too much it might jam into the spring whereas on the rear it appears to line up straight so you don't run that same risk. I'm not sure if that's something caused by lifting the TJ but there's a noticeable difference between the angle of the bump stop from front to rear. Regardless, I put one of these up front to supplement my bump stop pucks because I still got some contact with the fender. After installing them in the front a few weeks ago I squished the tire up in there as much as I could in my garage & the cup clears the spring but I'm going to take a closer look at it when the weather improves & I can get it up to the mountains & put it on their ramp, I not only want to make sure it's not interfering with the spring but also make sure it's sized correctly, I think I may have to cut some back off.

I ended up stacking two on the rear as one wasn't enough, I now have a total of 3 inches in the rear, kind of hard to see in the photos (top is front and bottom is rear):

 

[jjvw]

... if you lower the cup too much it might jam into the spring whereas on the rear it appears to line up straight so you don't run that same risk. I'm not sure if that's something caused by lifting the TJ but there's a noticeable difference between the angle of the bump stop from front to rear.

The plucking action of the cup against the coil comes from an unfavorable combination of bump stop extension, lift, control arm travel arc, caster and axle position.

 

[Rooster]

Kind of a related question- I have a set of Daystar extended bumpstops and those bastards will NOT go into the new stock cups. Any tricks to get them in??

 

[ranger101]

Rubber mallet, 2x4 and some dish soap. I got mine centered on the cup, put the board over it and gave it a couple good smacks with the hammer. A little easier said than done, but it will work.

Unless they’re the bolt in style..

 

[Rooster]

Jeep is on the lift, spring installed, trying to get it installed with a crowbar and exercising my cuss words.

 

[ranger101]

Hmm... slip a 2x4 in between the spring and let the weight of the Jeep push it in?