Weight - there is a 25 pound difference between the T5 and Tremec 3550/TKO - about the same weight as 4 gallons of gasoline. The 25 pounds isn't going to make a measureable difference in a 5 speed car.nos707 said:Im leaning towards the GF! For the weight issue, and because ive seen videos of the sick89 car running 9's on slicks, with low 1.3 60ft times!!