The two are within 100 rpm, but
Originally Posted by Craig2425
When you change the gears to 4.88/5.13 what does this do to your speed on the freeway and mpg.
If you regear to 4.88/5.13 you'll be able to use the O/D SOLID, except for steep hills and that'll be with 33"/35" tires--
I have 5.38 gears and at 60mph/2250 rpm-O/D 19 mpg-
At 70 mph/2600 rpm-O/D- 17 mpg
At 60 mph/2250 rpm-O/D- 16 mpg-TOWING MY TRAILER !
You can just hear the little 3.8L-whispering--"Man, it feels good"
Well, maybe not but that's what it feels like-
I have a JKUR and when off-road, before the regear (5.38), I had to stay in 4lo (desert heat) to keep the auto tranny from getting real hot and that was with aux cooling--now I can travel most of the time in 4hi, because of the regear and the tranny stays cool-
With a dana 35/44-you can never go to tall in regearing and 5.13 (Dana 35) and 5.38s (Dana 44), are the limit so far and thats PRIMO--
If you go to 4.88/5.13---you'll really enjoy the freeway and get much better gas mileage !