Bump Stop And Shock Length Clarification

[Westbrook]

I've had a 3" zone lift for 10+ years and I want to replace the shocks (RS5000X) and springs (already have BDS 3" front and 2" rear springs) as well as properly setup my bumpstops (hockey pucks) seeing as I've highlined and gone to 35s. I've been referencing the great threads from Fuse but still have a couple questions.

I've only worked on the front so far but I think once I get it dialled in the rear should go smoothly. I did miss getting a measurement with the tires off, and shocks disconnected but I believe thats only important for shock length and I can do that after. I removed the shocks and springs and put tires on to get my shock and bump stop measurements and came up with these numbers:

Passenger Side: Bumpstop: 3"
Shocks compressed: 16"
Shocks extended: 22.5"

Driveres Side: Bumpstop: 3"
Shocks compressed: 17"
Shocks Extended: 23.25"

First off, does 3" bumpstop seem like a plausible number? Not necessarily a good number or a perfect size, but with how my Jeep is set up right now, thats what I have to work with.

Second, my numbers for the shocks are different from each other, I'm guessing the axle just wasn't hanging, lifted level? So if I went with shocks that could compress at least 16" and extend at least 23.25" will that work? These look like they would fit that description if thats the case https://www.gorancho.com/products/s...er/rancho-rs5000x-shock-absorber-rs55239.html

Thanks in advance for the help!

 

[The4bangertj]

Set up for length by compression first and use the springs to get close to the 50/50 shock travel bias. With stock mounting a ~15.5in compressed length will require 2in of extended bump stop. Outboard or 12in travel shocks are another topic I’m still trying to learn on setting up properly like others have here on this forum.

Most people run a 4in lift with 2in extended bumps on 15.5in compressed length shocks which will get you right in the ball park of 50/50 shock bias and traditionally run around 24in extended (~10in travel front 9 rear) (different brands very in these lengths by a little bit) So having less lift and more bump stop you’ll have less uptravel which is less ideal but you seem to know that already.

Yes the track bar will kinda hold one side up more than the other when full drooped like that. Given your situation I’m assuming you need 3in extended because of other clearance issues yes they should work and I believe a shock labeled for 6in of lift are built around 3in of bump stop and you’ll have a lot more droop with a longer shock as well as the 3in lift coil probably wont stay seated in full droop either.

 

[Westbrook]

So from what you're saying, it sounds like I'm on the right track and the measurements I've come up with aren't ideal but not outrageous. The first contact that my tires make is my drivers tire on the bolt head for my steering box, I've never heard anyone mention that as a point of contact before but I guess my Jeep is just a little bit different...

 

[The4bangertj]

So from what you're saying, it sounds like I'm on the right track and the measurements I've come up with aren't ideal but not outrageous. The first contact that my tires make is my drivers tire on the bolt head for my steering box, I've never heard anyone mention that as a point of contact before but I guess my Jeep is just a little bit different...

Yup, I’ll assume backspacing can help with that clearance too

 

[Westbrook]

Right, I have Pro Comp 7069s with 12.5" wide tires. Looks like the 7069s they carry now have 3.75 backspacing, I'm assuming that hasn't changed in a few years but I can't say with 100% confidence that my rims have the same backspacing. I've also already added two washers on the steering stops.

 

[Westbrook]

As an update, I got the front all put back together today, other than shocks and it looks like at ride height I have around 20.5" between shock mounts which puts me somewhere in the range of a 50/50 split. Going to start working on the rear tomorrow but it looks a bit simpler than the front end. Once I get that put together I'll measure for shocks and order fronts and rears together.

 

[Westbrook]

Finally got around to getting the rear end sorted out. Got laid off and had our first child over the last couple months so life has been a little busy. Looks like the 2" bumpstop extensions that came with my 3" Zone lift will still work well for what I've got. Shock length extended is about 22" and collapsed is about 14 1/4" so for shocks I can go with RS55124 https://www.gorancho.com/products/s...er/rancho-rs5000x-shock-absorber-rs55124.html

Kind of off topic, if I don't get an answer here I'll start a new thread. I have a set of rear double adjustable UCAs that I've had for a couple years and need to install. Because I only have the uppers do I just install them directly in place of the stock UCAs that I have now without changing any length?

 

[JMT]

Finally got around to getting the rear end sorted out. Got laid off and had our first child over the last couple months so life has been a little busy. Looks like the 2" bumpstop extensions that came with my 3" Zone lift will still work well for what I've got. Shock length extended is about 22" and collapsed is about 14 1/4" so for shocks I can go with RS55124 https://www.gorancho.com/products/s...er/rancho-rs5000x-shock-absorber-rs55124.html

Kind of off topic, if I don't get an answer here I'll start a new thread. I have a set of rear double adjustable UCAs that I've had for a couple years and need to install. Because I only have the uppers do I just install them directly in place of the stock UCAs that I have now without changing any length?

If you don’t have an SYE, then yes. Set them the same as stock length.

 

[JMT]

I've had a 3" zone lift for 10+ years and I want to replace the shocks (RS5000X) and springs (already have BDS 3" front and 2" rear springs) as well as properly setup my bumpstops (hockey pucks) seeing as I've highlined and gone to 35s. I've been referencing the great threads from Fuse but still have a couple questions.

I've only worked on the front so far but I think once I get it dialled in the rear should go smoothly. I did miss getting a measurement with the tires off, and shocks disconnected but I believe thats only important for shock length and I can do that after. I removed the shocks and springs and put tires on to get my shock and bump stop measurements and came up with these numbers:

Passenger Side: Bumpstop: 3"
Shocks compressed: 16"
Shocks extended: 22.5"

Driveres Side: Bumpstop: 3"
Shocks compressed: 17"
Shocks Extended: 23.25"

First off, does 3" bumpstop seem like a plausible number? Not necessarily a good number or a perfect size, but with how my Jeep is set up right now, thats what I have to work with.

Second, my numbers for the shocks are different from each other, I'm guessing the axle just wasn't hanging, lifted level? So if I went with shocks that could compress at least 16" and extend at least 23.25" will that work? These look like they would fit that description if thats the case https://www.gorancho.com/products/s...er/rancho-rs5000x-shock-absorber-rs55239.html

Thanks in advance for the help!

Cycle your suspension. You want a shock that will give you 50:50 travel. 7.25” of total travel seems low for what you could accomplish at 3” suspension lift. A body lift will enable you to remove that much bump stop if tires are the limiting factor, but shocks should be the limiting factor if you’re setting them up correctly.

A little tire rub on a shock tower or CA never hurt anyone.

 

[Westbrook]

Cycle your suspension. You want a shock that will give you 50:50 travel. 7.25” of total travel seems low for what you could accomplish at 3” suspension lift. A body lift will enable you to remove that much bump stop if tires are the limiting factor, but shocks should be the limiting factor if you’re setting them up correctly.

A little tire rub on a shock tower or CA never hurt anyone.

I cycled my suspension using the walk throughs posted by Fuse on how to measure for bumpstops/shocks. This is with a little bit of rubbing at probably 25 psi. I figured with tires aired down the rubbing will be fine. I know my results arent ideal but for now I think this is as good as its going to get.

 

[jjvw]

I cycled my suspension using the walk throughs posted by Fuse on how to measure for bumpstops/shocks. This is with a little bit of rubbing at probably 25 psi. I figured with tires aired down the rubbing will be fine. I know my results arent ideal but for now I think this is as good as its going to get.

Tire rubbing is fine as long as it isn't causing damage. People worry too much about it.