ok my question is with 513s, and 35s in an automatic, what rpm are you turning with the overdrive on at 60mph, 65mph and 70 mph thanks guys

 

SGT EVIL posted this - 5.13 auto with 35's at 70 is 2600 RPM's

 

do you know if thats with the od on?

 

that almost sounds like it would have to be with the od on, it would be much higher if he were running it in 3rd.

 

I've got 35's and 5.13's and turn 2600 rpm at 75 mph (by GPS). At 65 mph I'm turning 2250 rpm.

To my way of thinking this is the perfect combination for the JK, especially a heavy Unlimited. Stock (32"/4.10) was 2250 at 75 and prior to the gears (35"/4.10) was 2050. The cruise works much better and it will stay in OD a lot better. My milage is the same as stock; but the power is a lot better. Prior to the gears but with 35's I lost 4 mpg.

5.13's are the way to go. This little V6 likes to be above 2500 rpm and if you keep it under 3000 you won't hurt your fuel economy.

 

Good post. And yes, my experience is very few 35s measure 35" when mounted. Some 315s are less then 34" depending on wheel width

 

well im getting the Nitto mud grapplers in 35/12.5/17 and they are pretty close to 35 in , im currently running 410s so a swap is in my near future , i will run the 410s till the spring then swap them out , thanks for the info guys

 

My rpms are close to the above #s but milage drops for sure above 2500..I wish the rpms were a bit lower because I like to drive above 70 but I think it trns too high. OD works much better than before but not quite like stock..so all in all the 513s are the choice for the autos w/ 35s