Originally Posted by 4wheeljunky
isthat for more torque? never been really big on gearing are the 4.11s gas eaters?
The way I understand it, 4.11 gears with a 4 banger are to compensate for the power the engine doesn't put out. To my knowledge, all 4 bangers have 4.11 gears factory. Where as my straight 6 came with 3.07 because the engine puts out more power(Some straight 6's had a little lower gearing).
Having the "perfect" set up is good for both offroading and onroad(gas mileage). Rubicons are designed to be good offroad. For rock crawling in particular, slow and low gears with plenty of power is the way to go. On 31" tires, having the straight 6, 4.10 gears, and 4:1 TC(all of this factory on the Rubicon) is to give you that "perfect" set up. Even your tranny type has an effect, since most autos have less gears they typically will run deeper gears once you get larger tires(i.e. alot of TJ autos are 3 speed where alot of manuals are 5 or 6 speeds[6 speeds in the '05-'06 years]).
It all boils down to what tire size you want, what drivetrain you have/want, and what kind of driving(or offroading) you want to do.
Mud boggin', riding sand dunes, trail riding, rally racing, and other types of offroading also factor in to what gears/drivetrain you'll want.
Edit: someone correct me if I'm wrong please.