this is a diff idea,im putting a 2003 cavalier pro street/strip car together and i need to figure out a tranny,choices are 5 spd lenco,turbo 400 or a 4l80,,car is a full tube frame/strut front susp, 632'' bbc,fab 9'' rear end ,15'' rear tire,race car im putting on the street,,overdrive would help on the street,,any thoughts???