Lift and gearing
08-17-2016 | 01:25 PM
#1
Thread Starter
JK Newbie
Joined: Aug 2016
Posts: 6
Likes: 0
From: miami, fl
Lift and gearing
HI everyone! So I own a 2012 jku sport I have a few questions
I wanted to jump to 35in tires would this be possible with a 2.5in suspension lift?
Also I know going to a tire that size I need to do my gearing. So after many google searches and looking through threads it looks like 4.10 is the way to go. But that being said it looks like people only do them for the sake of highway power? So does that mean if I switch to 4.10 gears it would the rear only? Considering when I go mudding it's on 4 low?
I currently have 33s, I bought my jeep used with them installed and they never rubbed. Regardless I just installed xrc smitty fenders
*front fenders will go on as soon a o straighten my quarter panel, I had a small accident a couple weeks back
Thank you guys
I wanted to jump to 35in tires would this be possible with a 2.5in suspension lift?
Also I know going to a tire that size I need to do my gearing. So after many google searches and looking through threads it looks like 4.10 is the way to go. But that being said it looks like people only do them for the sake of highway power? So does that mean if I switch to 4.10 gears it would the rear only? Considering when I go mudding it's on 4 low?
I currently have 33s, I bought my jeep used with them installed and they never rubbed. Regardless I just installed xrc smitty fenders
*front fenders will go on as soon a o straighten my quarter panel, I had a small accident a couple weeks back
Thank you guys
08-17-2016 | 01:42 PM
#2
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 162
From: Austin <--> Colorado Springs
There are two threads stuck right to the top of this Modified area (FAQ's and Thoughts On Lifts). Start with them.
2.5" with flats is plenty of room for 35's. You should be on the bumpstops before the tires touch.
Gearing is subjective. Drive with the bigger tires and decide for yourself if it is worth the high price tag. (but just so we all know when replying, what gears do you have now, and which transmission?)
Unless you never want to put it in 4wd, yes, you need to gear both front and rear axles. A typical charge for gears/labor/out the door is around $1500 or so, could be lower in your area, or might be up near three grand. Check with several shops, and get reviews from other people before deciding.
And if you can, find someone local who has the gears and tire size you are thinking about and see if you can go for a ride. Be sure it has the same engine also, not the older 3.8
2.5" with flats is plenty of room for 35's. You should be on the bumpstops before the tires touch.
Gearing is subjective. Drive with the bigger tires and decide for yourself if it is worth the high price tag. (but just so we all know when replying, what gears do you have now, and which transmission?)
Unless you never want to put it in 4wd, yes, you need to gear both front and rear axles. A typical charge for gears/labor/out the door is around $1500 or so, could be lower in your area, or might be up near three grand. Check with several shops, and get reviews from other people before deciding.
And if you can, find someone local who has the gears and tire size you are thinking about and see if you can go for a ride. Be sure it has the same engine also, not the older 3.8
Last edited by nthinuf; 08-17-2016 at 01:44 PM.
08-17-2016 | 01:46 PM
#3
JK Freak
Joined: Aug 2007
Posts: 585
Likes: 0
From: Denton, TX
First answer: 2.5" lift is plenty to run 35's. Technically you could run 35's without a lift at all if you run flat fenders. I run a Rock krawler 2.5" lift with Poison Spyder crusher flares and 37x12.50-17 Nitto Trail Grapplers. Been running it for over 4 years without issue.
As for gearing....if you're never planning to run any larger than 35's, then 4.10s should be fine. But if you're going to spend the money regearing your axles...two things I'd recommend. First off......if they're not already in there, add lockers to both axles. You're going to be pulling gears out already anyway, so why do double the work and pay for it twice? And second....if you're going to regear....make the jump to 4.56s and call it good. Then if you ever decided to run 37's, you could. It wouldn't be ideal, but you could. Seemingly for the Pentastar, 4.88s seem to be the magic number for larger than 35" tires. At least from everything I've read and been told.
Hope that helps.
As for gearing....if you're never planning to run any larger than 35's, then 4.10s should be fine. But if you're going to spend the money regearing your axles...two things I'd recommend. First off......if they're not already in there, add lockers to both axles. You're going to be pulling gears out already anyway, so why do double the work and pay for it twice? And second....if you're going to regear....make the jump to 4.56s and call it good. Then if you ever decided to run 37's, you could. It wouldn't be ideal, but you could. Seemingly for the Pentastar, 4.88s seem to be the magic number for larger than 35" tires. At least from everything I've read and been told.
Hope that helps.
08-17-2016 | 05:32 PM
#7
JK Enthusiast
Joined: Feb 2012
Posts: 479
Likes: 35
From: St. Johns, FL
I just pulled trigger on Cooper STT Pro LT315/70R17, I currently have 2008 JK with TF 2 1/2" lift and have 36K on Pro Comp 33x12.50x17 with a 3.73 manual. I know there are all kinds of recommendation for regearing but would like to get good advice on whether to go 4.56 or 4.88. I must cruise 3-4 hours highway to get to any good wheeling areas, so looking for any input to help my decision what gearing to go with? Sorry to hijack thread just didn't want to start another gear thread.
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08-17-2016 | 05:53 PM
#8
Super Moderator
Joined: Dec 2010
Posts: 5,642
Likes: 484
From: Knoxville
I just pulled trigger on Cooper STT Pro LT315/70R17, I currently have 2008 JK with TF 2 1/2" lift and have 36K on Pro Comp 33x12.50x17 with a 3.73 manual. I know there are all kinds of recommendation for regearing but would like to get good advice on whether to go 4.56 or 4.88. I must cruise 3-4 hours highway to get to any good wheeling areas, so looking for any input to help my decision what gearing to go with? Sorry to hijack thread just didn't want to start another gear thread.
http://i302.photobucket.com/albums/n...Kgearing-1.jpg
08-20-2016 | 05:25 PM
#9
JK Enthusiast
Joined: Nov 2015
Posts: 171
Likes: 1
From: Fresno
First answer: 2.5" lift is plenty to run 35's. Technically you could run 35's without a lift at all if you run flat fenders. I run a Rock krawler 2.5" lift with Poison Spyder crusher flares and 37x12.50-17 Nitto Trail Grapplers. Been running it for over 4 years without issue.
As for gearing....if you're never planning to run any larger than 35's, then 4.10s should be fine. But if you're going to spend the money regearing your axles...two things I'd recommend. First off......if they're not already in there, add lockers to both axles. You're going to be pulling gears out already anyway, so why do double the work and pay for it twice? And second....if you're going to regear....make the jump to 4.56s and call it good. Then if you ever decided to run 37's, you could. It wouldn't be ideal, but you could. Seemingly for the Pentastar, 4.88s seem to be the magic number for larger than 35" tires. At least from everything I've read and been told.
Hope that helps.
As for gearing....if you're never planning to run any larger than 35's, then 4.10s should be fine. But if you're going to spend the money regearing your axles...two things I'd recommend. First off......if they're not already in there, add lockers to both axles. You're going to be pulling gears out already anyway, so why do double the work and pay for it twice? And second....if you're going to regear....make the jump to 4.56s and call it good. Then if you ever decided to run 37's, you could. It wouldn't be ideal, but you could. Seemingly for the Pentastar, 4.88s seem to be the magic number for larger than 35" tires. At least from everything I've read and been told.
Hope that helps.
08-21-2016 | 07:58 AM
#10
JK Junkie
Joined: Mar 2012
Posts: 2,482
Likes: 1
From: Denver, CO
First answer: 2.5" lift is plenty to run 35's. Technically you could run 35's without a lift at all if you run flat fenders. I run a Rock krawler 2.5" lift with Poison Spyder crusher flares and 37x12.50-17 Nitto Trail Grapplers. Been running it for over 4 years without issue. As for gearing....if you're never planning to run any larger than 35's, then 4.10s should be fine. But if you're going to spend the money regearing your axles...two things I'd recommend. First off......if they're not already in there, add lockers to both axles. You're going to be pulling gears out already anyway, so why do double the work and pay for it twice? And second....if you're going to regear....make the jump to 4.56s and call it good. Then if you ever decided to run 37's, you could. It wouldn't be ideal, but you could. Seemingly for the Pentastar, 4.88s seem to be the magic number for larger than 35" tires. At least from everything I've read and been told. Hope that helps.