Quote Originally Posted by willowbilly3 View Post
It's one of those things that would be interesting to see the real world numbers comparison on a dyno. Maybe the difference would be minute.
According to my calculations your 4.11 with a .62 overdrive would produce the same total ratio in top gear as a 1:1 tranny top gear and a 2.54 rear end.
That would be correct, but with a 2.97:1 low gear and a 4.11:1 rear gear, it launches quite well!!!! The lowest ratio low gear I know of in a stock box 4 speed would be a 2.20:1..... When you figure the ratio in low gear, then it becomes evident which rear gear will give the hardest launch and quickest 60 ft. time......a four speed with a 2.20 low gear, 1:1 top gear and a 2.54 rear gear will not launch near as hard as a 5 speed with a 2.97:1 low gear, 1:1 fourth gear, .62 overdrive 5th gear, and a 4.11:1 rear gear....(and we won't even talk about how much fun the five speed is with a 6.00:1 rear gear!!!!)