You scored with this combination.The rear is 3.42 Posi from a Monte SS that I got from a member here - Malibu Mike7981. The T5 is from a 1989 IROC Camaro, which has a 2.95 first gear and, I think, a 0.83 5th gear. This gives a 10.1 to 1 overall 1st gear ratio. This works pretty nicely with the 4.3's horsepower and torque. That said, it ain't no hot-rod!