Quote: Seeing as how my son started this post I'll drop my combo for all to scrutinize. engine 446 ci big block car 68 Roadrunner weight 3926 with me in the seat Trans is stock 23 spline A833 no mods. trans fluid ATF dextron Launch rpm 49-5600 rpm depending on track conditions. shift 6400 rpm trap rpm 6300 slick pressure anywhere from 15 - 19 psi rear gear 4.56 Dana Clutch is Center Force Dual Friction 11" with aluminum flywheel (13 pounds) best et and mph is signature