I am planning to use a T5 behind a .030 over 292. The rear end I will use is from a 68 GMC and I think the ratio is around a 3.22. This is going into my '53 1/2 ton. I would like to find a 3.07 because the 292 is such a brute that I think it will handle the over drive. With the price of gasoline I am trying to get a few more mpg. Don