FYI, Tremec and Dana are joint ventures that purchased Borg-Warner in 1997. Not really a difference in trannys as the Tremec in the GTO is just current. The SS weighs roughly 300lbs less from what I can remember. I know that shortly after the LS1 WS6 cars came out, I saw a lot running ~13.7 at the track but a lot has changed since then.westell said:SS has Borg-Warner 6 speed, GTO's Tremec
SS has Drexel Torsen 3:43 solid axle, GTO's 3:46 Dana independent
SS weight slightly less (don't have, sorry)
SS has slightly wider stock tires, still won't hook, GTO has more tire hop, though.