Oh, and the Can Am came with a TH 400 not the TH 350, when equipped with the Pontiac 400 motor, which most of them had. Some were produced with the Olds 403 motor for sale in California which did come with the TH350. The TH 400 had a slightly steeper 1st gear than the TH350.
A 4 speed manual was never offered at all.
Strange that the 1977 Trans Am came with the TH350 with an optional 4-speed manual. But I never got beat by one of those cars, ever. I would always nose them out even with the Can Am being a couple a hundred pounds heavier than the Trans Am.
Some say that Pontiac stockpiled special engine parts for the Can Am 400 motor, meaning that they took parts with the lowest tolerances and put them into one engine. I think it made a difference. They also used a special 6x head with a slightly smaller combustion chamber to raise the compression slightly.