[ls1ac]

There are several gear sets for the t56, 1st from 2.66(viper) to 2.97(mustang). and 6th from .62(mustang) to .50(viper). Plus some other custom race gear sets.
The "bell housing" is a set of parts that bolt together to give spacing and end bolt patern. I used a chevy to a mopar to a ford race box. Had to cut and turn the shaft to fit the shorter spacing.
6th is great on the highway above 70mph but I have never found it on the track.
What is steep is the cost. Even if you do your own build it will lighten the back pocket.