Regearing a JLU Sport

[AlgUSF]

I'm not planning on doing anything crazy, but I have a 6MT JLU Sport w/ LSD and would like a bit more Tq and plan on getting 35's once the warranty expires. I think I'd like to run 4.10's (like the Rubicon), would a shop be able to put 4.10s into my existing differentials, or do I need to do an axle swap? I've looked around a bit on this forum, and couldn't find any conclusive answers.

Sponsored

 

[word302]

I'm not planning on doing anything crazy, but I have a 6MT JLU Sport w/ LSD and would like a bit more Tq and plan on getting 35's once the warranty expires. I think I'd like to run 4.10's (like the Rubicon), would a shop be able to put 4.10s into my existing differentials, or do I need to do an axle swap? I've looked around a bit on this forum, and couldn't find any conclusive answers.

4.10s are an easy swap but honestly if you're going to spend the money I'd go at least 4.56. I think you'd be even happier with 4.88. I'm running 5.13 with 37s on the manual trans and it's really in the sweet spot.

 

[Shamwedge]

I thought the general consensus was to not run 35's because of the front axle. Is that not the case?

 

[AlgUSF]

4.10s are an easy swap but honestly if you're going to spend the money I'd go at least 4.56. I think you'd be even happier with 4.88. I'm running 5.13 with 37s on the manual trans and it's really in the sweet spot.

Did you turn the wrench yourself, or have it done by a shop? I usually do my own car work, but this seems quite specialized. Might be difficult to find someone local qualified to do it on a brand new Jeep.

 

[blueweb]

I thought the general consensus was to not run 35's because of the front axle. Is that not the case?

35s is like the max size you want to go on Dana 30/35.

You could technically 37s if you are not going to ever go off-roading... but what's the point in 37s then?

 

[word302]

Did you turn the wrench yourself, or have it done by a shop? I usually do my own car work, but this seems quite specialized. Might be difficult to find someone local qualified to do it on a brand new Jeep.

I did install them myself.

 

[AlgUSF]

I did install them myself.

What would you compare the difficulty level to? I've done timing belts on Hondas before, I've also rebuilt entire front end suspensions on Hondas and Toytotas.

 

[word302]

What would you compare the difficulty level to? I've done timing belts on Hondas before, I've also rebuilt entire front end suspensions on Hondas and Toytotas.

It's not necessarily extremely difficult but does require specialized tools and a high attention to detail. If you haven't already check out @chevymitchell's 2 threads that are stickied at the top of this sub-forum.

 

[Djhyper66]

I paid $1400 for parts and labor for revolution gears kit for my jl sport , went with 4.88 cause I’m running 35s. My car felt super sluggish with 35s. Only took me 1 week to know I was going have to regear with the bigger tires . My Jeep bearly has 4K mile on it , with better gears it run great at low rpm and doesn’t have to work so hard on the road .Super light on the gas. ( still in break in period ) but enjoying the new mod.

 

[zeebo56]

4.10s are an easy swap but honestly if you're going to spend the money I'd go at least 4.56. I think you'd be even happier with 4.88. I'm running 5.13 with 37s on the manual trans and it's really in the sweet spot.

Id agree if you are spending the money make it worth it. You would probably like the 4.88s more.

Sponsored