Wondering what I should get I don't tow anything , I use the bed Only . curious what Difference would be from a 3.55 limited slip to a 3.73 limited slip or a 3.73 electronic locking rear ? Wich is better in MPG/POWER to the ground ? It will be in a SUPERCREW or a CREWCAB config with the 5.5 bed and 5.0 . Holy crap does this Motor have alot of POWER drove it home 60 miles one way gettng average 19.5 , and thats with the foot into it most of the time and PASS driving . the SUPERCREW felt quicker by the weight difference .