Just stole some 285 duratracs from work (660 out the door) and my current set up is 3.73, automatic, 3.8 liter slug, sport. MIGHT GO TO 35'S, but thatll be when its decommissioned to trail rig only. i need practical every day driver use of this jeep, highway, city split and i will be wheeling it a lot more than the average jk driver will be. sand dunes and rocks are my poison, so light use but not so light if you catch my drift. any suggestions, throw them my way, jeep on guys
I'm still running stock rubi 4.10's on 37 mtrk's. plan to go to 5.13's.
Lacks any kind of 1st take off power and 6th is useless on any sort of incline. (and 5th and 4th on steeper climbs)..
Running 5.38s on 35s (probably like 33-34s now), 3.8L, automatic, 4 door. I turn off overdrive around town if there's traffic. 4th gear is still a dog.
I have an 11 with 3.8 , 6 speed , 315/75/16`s and 4.88 gears . I did just over 300 miles today and with the combo of 80mph hwy and 60 mph rural rds my average was 19.1 mpg
ok now, what about MPG, i know its a jeep and not looking for perfect MPG but Im a 3.8 07 X and from what im told its 3:10's I'm on 33s and 6th gear is a dogg! its a pain!!! but I'm not going up to 35's anytime soon.
With an 07-11 automatic, if anything, 4.88s won't be enough. I'd do 5.13s with 33s and 5.38s with 35s or 37s, but 5.13s is the lowers gearing you can out in a Dana 30 front axle.
6 speed 07-11s have a completely different transmission ratio and don't need as low gearing.
I have those exact tires on my jeep, running the stock 3.73s. I didn't really notice a difference when going from stock, it's never had much pick up. Duratracs are a relatively light tire compared to many MTs, so that helps a little.
If you ever plan on towing anything more than 50 pounds go with the 5.13's
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