Which rear end?

it depends on what kind of driving you`ll be doing more of; city vs. highway. also, what is the HP output of your engine? and don`t forget tire size as well. MANY things have to be considered for getting the best fuel mileage possible. oh, and how heavy your right foot is as well.:)

in theory 3.42 will give the best mileage, however in practice sometimes a deeper gear like a 3.73 will give you better mileage as you don't have to get as deep into the peddle to get going. if you run empty all the time, get a 3.42, if you actually put something in the bed and tow only occasionally, get a 3.73, if you tow more than occasionally, get the 4.10.

a limited slip uses clutches ( or gears, if a torsen type) to literally limit the slip that a tire can achieve on limited traction surfaces. they work fine on the street, don't work at all off road.

a locking differential (ignoring the selective lockers) is actually misnamed. they actually are automatic unlockers. in a rest state, the axles are locked together like a spool. however, in a coasting turn, the locker will allow the outer wheel to overrun the inner wheel. if you go into a turn and remain under power, the locker will not unlock and understeer will result.

HTH, Bret

Which series? It sounds like you're looking at a 1500 4x4. If so, you probably are looking at either the 4.8L V8 or the