MarcF

Yes, i used the AEV procal and it helped a bit. The cold weather and the wind seem to really make it bad.

WineCountryWheeler

I have a 2012 JKU Sport Manual trans and 315 Duratracs on 17x9 wheels (measure 33.75 mounted at 29psi). Still working the 3.21 over here for about 9 months now. Been wheeling with it, several black diamond trails, including Badge of Honor trail Gold Mountain. Doable? Yes, even off road. Dropping into 4LO the thing is a beast. Now, that said...will 4.56 be WAY BETTER? Most likely. Re-gearing in March.

The biggest thing that I had to get used to when I went to 315s was how long I had to hold each gear before shifting lol! I'm in 3rd until about 60mph And 6th is pretty much completely non-usable.

RageQuit4913

i also have the 3.21 with 35's and auto. I did the superchips flashpac update to gearing and tire size with a noticeable difference. Engine is very responsive for DD. Havent been offroad yet but did haul a boat and it felt like it had the power and put it down sufficiently.

rcjackson0926

I have been okay with 3.21's on the street with 35's, but I am going to re-gear it to improve it off-road.

Rusty

Jahamm88

Not on 35s but on 33s with 321s and I've had no issues on or off-road. I'm coming from a 2000xj into this thing so it feels awesome. I probably will regear after my powertrain warranty runs out but see no reason to change things now

RRASCHKE

I have a 2015 JKU 3.6L Auto with a 4" lift 20x12 rims and 35s. Im stuck, not sure if I want to go with 3.73 or 4.10???

rob_engineer

I'm pretty sure nobody in here would suggest 3.73 for 35's. most would say 4.10 or maybe even higher.