There are a number of gearsets available for a Proflite. Mine is and F1 2.24/1.48. Choices go from first gears of 1.78 all the way to 3.20, why they are so popular in Comp, SS and Stock. We have two transmissions for the Vette one is an F8, 2.18/1.48 the other is and an E8 2.25/1.51. The parts to run this stuff are not cheap for sure and from my experience they work great for higher HP stuff but when the torque numbers start going up they can become a problem. Some friends with a TS car tried for about 6 months to make one work for their combo with one of the big name shops in the end they just couldn't take the torque and they went to a TH400 based unit