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Message: <blockquote data-quote="JiMi_DRiX" data-source="post: 763944" data-attributes="member: 12314">First off, wooo! I'm 25 today!! Which means I'm in a good mood and I'm looking at new toys for the Mustang.The drivetrain is all stock, and I want to pep it up some. I know gears on the 4.6 cars are a must, but I'm not sure what to get. I drive on the freeway every now and then, and if I get 4.10's, I dont want it screaming in 5th gear. My Monte Carlo already has that problem with the 3speed and 3.73's, I cant drive it on the freeway anymore. My Mustang is my daily driver, so I have to still keep it that way to some extent...Can anyone with a pretty much stock setup tell me what RPM their car runs at in 5th gear on the freeway with either 4.10s or 3.73s?My car has 34k miles.. what else can I do for maintenance while the rear end is open up? I'm looking at AM's site, and they have lots of rear end parts. I'm guessing that aside from gears, a posi unit is going to be extra, right? I dont think mine is posi... one wheel wonder! woot!As much as I really want exhaust, I think gears might have to come first, its a sloth taking off, its terrible!</blockquote>