Since it is winter time and not much wheeling going on I decided to put my Rubi tires back on in order to save my 34's the daily wear. Needless to say, it is my opinion that the Jeep should have came factory with this setup. Around the hills of Colorado the Jeep now drives like most other cars. I actually stay in 4th gear for most hills now and the tranny shifts like butter. I did have to drive to Denver the other day and with the speed limit being 75 mph I got 16 mpg with the rpms sitting at 2800.

Cliff notes
5.13 + stock tires =
high speeds @ 75 mph w/ rpms @ 2800 = 16 mpg
5.13 + stock tires = auto tranny shifts like butter

My .02

 

just out of curiosity, did you make sure to recalibrate your speedometer after switching out your tires?

 

so you have 32's on it and your getting 2800 at 75 ?!?! wow thats sweet. im lifted 5' with 35's and trying to go over 65 is 3k+ the thing screams at me. Im not so sure i could get it to 75

glad it worked out for you man.

 

Thats just wrong. @ 72 mph i'm doing 3000 rpm in 6th gear.

 

I am guessing part of the reason he is seeing lower RPMs is because the auto has a lower overdrive than the six speed.

 

.........The 6 speed has a 0.84:1 in 6th gear.

 

I think the auto is .69, giving it a lower RPM in overdrive than the 6 speed.

 

something doesn't sound right, maybe you haven't recalibrated your speedo


I'm running 5.13's, 35's and an auto. I have recalibrated my speedo with a pro comp accu pro and verified it's correctness via GPS (I used the chalk method for correct tire diameter).

 

Yes I did

 

No I did and I used the accu pro as well. My speedo was spot on with the GPS as well. Maybe 1 mph off at 75.