Quote:
Originally Posted by 694.1
Changing the trans to a modern unit would also require a gear change as these cars used a high ratio with a stump puller 1st gear.
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Could be, but a ratio in the high 2-series works fine with a 347-inch engine and a TH400.
Torque converter technology back in the '50s wasn't all that well-refined so many of the cars used a stump-puller low gear to compensate for the lack of torque multiplication provided by the torque converters or fluid couplings.
Pontiac built plenty of 350-powered A-body and F-body cars with a 3-speed auto and a 2.78 or 2.56 rear in the '60s and '70s, they're not much different in car weight and horsepower as compared to a 1957 Pontiac.