I got an 1980 I am building. Its got 20r going to have a w-56 5spd, either 38x12.50r15 or 38.5x15.50r15s, header, 2inch exhaust, bodded bed, removed most of the **** not needed. -What I am wondering is who is running 4.10 and dual case with 4.7 and how has it worked for you. I am looking to do...