Quote Originally Posted by BurnTire View Post
I have 3:73's in my setup.

It all depends on what your final trap speed is going to be and planned shift points. If you use 4:10s on a 28" tire and trap around 130MPH plan on the RPMs being around 6200. I base this on a 29" tire height due to the slick growing. When I went from a 26" to a 28" tire on my stock 3:55s it did not affect my ET in a negative manner.

The 3.90 gears have some history of breakage and whine so I would stay away from those.

Check out the gear calculators here.
http://www.highperformancestangs.com....php?page=calc
You hear that Tony? 3.90's = bad lol. but back to the original thread, I think 3.73's will be fine, that's what I'll be going with when I get S/C