Bump Stop Clearance

[panozgts]

Hi all.
Trying to figure an issue out and hoping for assistance. Recently installed a Diesel specific 2.5" suspension lift kit on a '21 JLURD . The issue I am having is that I now only have 2" of clearance between top of bottom stop to the rubber cushion on the front. This is at standstill on level ground. This is allowing the front suspension to bottom out rather frequently even on minor bumps in the road at slow speed. On road its great but off road just about any pothole will bottom out even at 5-10mph speeds, definitely a solid contact of bump stop.

I guess my question is shouldn't I have gained more upward travel over stock after installing a lift kit?

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[Yellow Cake Kid]

It depends.

You may, or may not have a total of 2-1/2" extended spring height, and you have not mentioned if that is so.

You may or may not have increased the size of your tires, and you have not mentioned anything about that.

Here's a common scenario; A lift kit raises Jeep 2-1/2" with new springs, and new control aftermarket arms provide a lot more articulation at the joints, and the tire size is increased from 33" diameter to 37" diameter. In this case the bump stop clearance ends up just about the same as when you were driving stock on the 33's.

So, it depends.

 

[Roky]

Hi all.
Trying to figure an issue out and hoping for assistance. Recently installed a Diesel specific 2.5" suspension lift kit on a '21 JLURD . The issue I am having is that I now only have 2" of clearance between top of bottom stop to the rubber cushion on the front. This is at standstill on level ground. This is allowing the front suspension to bottom out rather frequently even on minor bumps in the road at slow speed. On road its great but off road just about any pothole will bottom out even at 5-10mph speeds, definitely a solid contact of bump stop.

I guess my question is shouldn't I have gained more upward travel over stock after installing a lift kit?

Need more information, what lift, did you add bump stop pucks, did you increase tire size, how much lift did you actually get, etc…
Pics also are a big help.

 

[panozgts]

It depends.

You may, or may not have a total of 2-1/2" extended spring height, and you have not mentioned if that is so.

You may or may not have increased the size of your tires, and you have not mentioned anything about that.

Here's a common scenario; A lift kit raises Jeep 2-1/2" with new springs, and new control aftermarket arms provide a lot more articulation at the joints, and the tire size is increased from 33" diameter to 37" diameter. In this case the bump stop clearance ends up just about the same as when you were driving stock on the 33's.

So, it depends.

Well yes tire size went up to a 37" though that has no bearing on axle travel up or down. Even with 37" tires, at full compression, I still have close to 6" of tire to fender clearance. On stock 33" and stock suspension I seemed to have had more upward travel and never hit the bump stops in similar situations. Overall spring length - new vs stock - I am not sure of since I did not install kit or have that info. That being said if lift is supposed to increase suspension travel by 2.5" (roughly) UP shouldn't that increase my bump stop clearance by 2.5" roughly? Every other dimension before and after lift went up 2.25-2.75" (fenders/bumper/frame/etc) As it sits I have right at 2" of upward travel before bump stops bottom out.

 

[hoag4147]

Well yes tire size went up to a 37" though that has no bearing on axle travel up or down. Even with 37" tires, at full compression, I still have close to 6" of tire to fender clearance. On stock 33" and stock suspension I seemed to have had more upward travel and never hit the bump stops in similar situations. Overall spring length - new vs stock - I am not sure of since I did not install kit or have that info. That being said if lift is supposed to increase suspension travel by 2.5" (roughly) UP shouldn't that increase my bump stop clearance by 2.5" roughly? Every other dimension before and after lift went up 2.25-2.75" (fenders/bumper/frame/etc) As it sits I have right at 2" of upward travel before bump stops bottom out.

It sounds like installer added bump stop pucks as mentioned by @Roky above. Definitely a quick pic of front spring area would determine. ??

 

[panozgts]

Need more information, what lift, did you add bump stop pucks, did you increase tire size, how much lift did you actually get, etc…
Pics also are a big help.

So I had installed EVO 2.5" Enforcer Overland kit. Tire size went to 37". roughly 2.5-2.75 actual lift of everywhere on body - fenders/bumper/etc. Tires wouldn't effect travel though unless they were hitting fenders which they aren't. Still have about 6" clearance at full compression between tire and fender. Bump stock pucks were with kit - roughly 4" tall from what I can measure from outside of spring. You can see they are pretty clean from when upper rubber contacts them. Clean area of shock is 2.5" - Im assuming upper bump stop rubber would compress 1/2" when loaded.

 

[Roky]

So I had installed EVO 2.5" Enforcer Overland kit. Tire size went to 37". roughly 2.5-2.75 actual lift of everywhere on body - fenders/bumper/etc. Tires wouldn't effect travel though unless they were hitting fenders which they aren't. Still have about 6" clearance at full compression between tire and fender. Bump stock pucks were with kit - roughly 4" tall from what I can measure from outside of spring. You can see they are pretty clean from when upper rubber contacts them. Clean area of shock is 2.5" - Im assuming upper bump stop rubber would compress 1/2" when loaded.

They should’ve only increased your bump 2” ish, so if you have as much fender clearance as you say, remove two of the pucks, assuming they are 1” pucks. Then cycle the suspension to make sure your shocks aren’t bottoming out, and if not enjoy your rig………this is assuming there isn’t another underlying reason they added so much bump………I haven’t worked on any diesels yet…….

 

[panozgts]

They should’ve only increased your bump 2” ish, so if you have as much fender clearance as you say, remove two of the pucks, assuming they are 1” pucks. Then cycle the suspension to make sure your shocks aren’t bottoming out, and if not enjoy your rig………this is assuming there isn’t another underlying reason they added so much bump………I haven’t worked on any diesels yet…….

Looks to be a solid 1 piece puck in there. I have talked with installer about the issue and taking back monday - Bilstein shocks closed until then - They seem to think something is way off with the kit as well since its bottoming out way too soon. Hopefully get an answer next week on how to remedy the issue.

 

[panozgts]

They should’ve only increased your bump 2” ish, so if you have as much fender clearance as you say, remove two of the pucks, assuming they are 1” pucks. Then cycle the suspension to make sure your shocks aren’t bottoming out, and if not enjoy your rig………this is assuming there isn’t another underlying reason they added so much bump………I haven’t worked on any diesels yet…….

Being it was part of the "kit" id assume that its partially correct and somehow its got wrong parts mixed in for gas JL? The Diesel is about 400 lbs heavier on front suspension so that would/could overly compress springs loaded/unloaded.

 

[Roky]

Looks to be a solid 1 piece puck in there. I have talked with installer about the issue and taking back monday - Bilstein shocks closed until then - They seem to think something is way off with the kit as well since its bottoming out way too soon. Hopefully get an answer next week on how to remedy the issue.

Let us know, as I’m trying to gather as much information as I can on all these different types of Jeep’s, lol. You got diesel Jeep, Jeep trucks, electric Jeep, pre-lifted Jeep, a V8 Jeep……..

 

[Yellow Cake Kid]

...tire size went up to a 37" though that has no bearing on axle travel up or down...

Think of it this way, you added 2-1/2" of clearance with the springs and took away 2" of clearance with the tire size increase.

The only way to determine what the minimum bump stop and maximum up travel you have available is to find out when and where stuff starts hitting other stuff.

Tell your shop about your concerns, and ask them to determine how you can enjoy as much travel as you may.

It sounds like they will need to suggest a different type of bump stop. The swap should be simple and cheap.

Have fun.

Good luck.

 

[panozgts]

Think of it this way, you added 2-1/2" of clearance with the springs and took away 2" of clearance with the tire size increase.

The only way to determine what the minimum bump stop and maximum up travel you have available is to find out when and where stuff starts hitting other stuff.

Tell your shop about your concerns, and ask them to determine how you can enjoy as much travel as you may.

It sounds like they will need to suggest a different type of bump stop. The swap should be simple and cheap.

Have fun.

Good luck.

Well after looking over everything and comparing part #s this is entirely the wrong kit for a Diesel front end. Spring P/N is coming up as gas engine 4.5" lift. Shocks coming up as gas 3.5-5" lift.
This makes sense so now springs and shocks have used up about 2" of travel just sitting still. And makes sense that a 4" tall bump stop came with front kit. Keep ya posted on outcome. Think going to get refund or correct kit installed - prob not EVO though unless they correct it. I kinda wondered why front spring had a curve to it.

 

[Roky]

Well after looking over everything and comparing part #s this is entirely the wrong kit for a Diesel front end. Spring P/N is coming up as gas engine 4.5" lift. Shocks coming up as gas 3.5-5" lift.
This makes sense so now springs and shocks have used up about 2" of travel just sitting still. And makes sense that a 4" tall bump stop came with front kit. Keep ya posted on outcome. Think going to get refund or correct kit installed - prob not EVO though unless they correct it. I kinda wondered why front spring had a curve to it.

Wow….. looking at that spring, you’re probably feeling coil bind before the bumps hit, lol….

 

[panozgts]

Wow….. looking at that spring, you’re probably feeling coil bind before the bumps hit, lol….

Oh im sure - Im going thru all the info I can find online and everything is leading to every part installed/sent by EVO is for a gas model version with 4.5" lift - WTF lol
it does ride smooth on the road though

 

[hoag4147]

Wow….. looking at that spring, you’re probably feeling coil bind before the bumps hit, lol….

Prob spot on . I would also guess bowing may have something to do with OEM trackbar. Front end most likely shifted close to inch with that size spring.

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