I am starting to save for tires and gears for my 14 JKU 6 speed MT. It has one of the new rancho 2" spring lifts. For tires im thinking between 33-35s leaning closer to the 35 size.

My question for those with similar set ups. What rpms are you running at 75 mph. I have seen the gear charts but also pictures showing much higher rpm for others. Also, what kind of mpgs are you guys getting. Right now I sit at 20 with 32s and 3.21 gears

Thanks

 

75mph @ 3000 rpm on straight away ....
60-65 mph up slight hill .....3000 rpm ....

Truck feels stock w 35" tires w 4.56 ...
I had 33" before w 3.21 and it felt sluggish...
Went to 35" w 3.21 , it turned into a Slug ....

 

I have 4.56 gears and a manual with 35 inch tires. At 75 MPH, I'm around 2700 RPM. I usually keep my speed at 65 to keep the RPMs down and get between 17.5 to 18 MPG. Thats with a cold tire pressure of 29 PSI.

 

Interesting I have 4.88 gears /automatic w/35" tires. At 78ish mph I'm 3000 RPM. I also like to stay around around 65-70 MPH to keep MPG's around 17 as well.

 

4.56 Yukons, 6th gear with 35's (measure to 33.75" now) I'm at 3K RPM at 75-80ish. 2700 Rpm at 70ish.

Also: 33's with a 2.5" lift are going to look really silly. You WILL regret it.