Then i guess i already have 3.73, whats wierd is when I look up rear ends all the rwd say 3.42 and the 3.73 all say 4wd only, mines not 4wd. Can i put a 4wd rear end on mine and be ok? Cause it should only matter if i had a front differential, right? Is there anything different on a 4wd rear end than a reg. rwd rear end?