I currently have the viper spec t-56 and 3.73's....... I know alot of people will say to go auto....(turbo car) But I like shifting to much and my car is more street car than anything.....for every day use the setup is fine but when I do track my car (1/8 mi, 1/4 mi, 1/2mi) 4th gear is to short 136mph top speed. But when I cruise on the interstate I have to cruise above 80 mph because of the cams...... I'm concisering swapping to a 5 speed and 3.31's out back.... Just don't know what trans will hold the power.