I just bought a 2007 JK X with a 4.5 inch BDS lift and 315/70R17 Kumho Road Venture MT KL71 tires. Just wondering if I need to regear or if the stock 4:10 gears will do fine?

 

I got an 08 jkur with 35 toyos and it was a little bit sluggish at the end of 5th and into 6th but I tossed on an airaid cold air and that pretty much fixed my problem but naw 4:10s will do u fine IMHO

 

Oh and i got a rough country 3.5 lift also

 

I have 4.10's and 35's and it seems fine, but by all means, its still a dog.. Haha

 

Mine's fine with a 6 speed even offroad. Try it first.

 

Mines an Automatic. It seems ok, just loses speed on the road going up hills.

 

Get a tuner or procal to calibrate the tire size. This will help correct the shifting. Also, keeping the overdrive off can help when encountering hilly terrain.

 

For an 07-11 a JK with 35in tires is like a stock JK with 3:18 gears. Most people choose 4:88 gears when moving up to 35in tires. A buddy of mine has this set up and the Jeep moves sweet.

 

It seems that many with autos even go for 5.13

 

I've heard that as well although I have not worked out the mathematics. For those with manual 5:13 is common for 37's for years 07-11. The general rule is that for every 2inches of tire size you move up one gear.

The Rubicon comes with 32's and 4:10's which makes a ton of sense for a 07-11
For 12-13 the 4:10 is better for a 33-34 in tire. 4:56 actually works out to be the proper gear for a 12-13 on 35's.