the car is Electronically limited to 155mph
meaning no changing the diff wont effect that much(donno how close to redline in 5th you are at with the current diff) Btw why does that matter? you cant really do 155 on the street or many tracks for that matter......
1991 Ford Taurs SHO 5 Speed White on Tan
1996 Chevy Lumina LTZ Rep 3.4L
1992 318i Coupe parts car
1992 325i Ls1 swap with a T56 6 speed 12.2 quarter mile
1976 Mercedes Benz 300D with a Ford 5.0L Fuel Injected soon to be Modded I am Captain Obvious