Top Speed with 4.10s?

**GottaHaveLS1** · 07-06-2008, 06:59 AM

I can't really test it out around where I live, but i'm curious as to what happened to my top speed after the 4.10 gear swap. It's an M6 bolt on car... before I used to tell people it will do 160 mph, but I dont think it will get up that high anymore. the fastest i've gone is 140 mph with the 3.42s. Fourth gear is pretty wound out at 100 mph, so what should i be able to hit?

**wultdat** · 07-10-2008, 12:27 PM

High 140 maybe?

**StuntmanMike** · 07-13-2008, 07:52 AM

Well top speed is in 5th right, because the car can't pull 6th gear at high rpm right?

Who knows, maybe with the 4.10's, the car can pull 6th at high rpm and you might still be able to do 160, or even faster.

**Wesman** · 07-15-2008, 04:28 PM

This should help you out:

http://www.f-body.org/gears/

Just plug in your car, tire size, axle ratio, and redline, and it will calculate everything else for you.

I have 4.10's in my M6 car, and when I plugged my info in, it says 4th tops out at 113 in 4th and 153 in 5th, which sounds about right. So after 153MPH I'd have to shift into 6th. It would probably still accelerate faster, just not as quickly as it would have in 5th with the stock gears.