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OK, I don't know much about those cars, BUT I do know a guy who had one. It had BOTH emblems on it, T-37 and GT-37. He couldn't get ALL the same emblems, so had to sub. the others for the car. Never did find out the difference or what one was correct. The guy who owned it a while back is a friend. I do know it was a 1971 version T/GT-37. Car was/is BLACK on BLACK bench seat 4 speed car. Factory 455 HO with 4.11's. Car is GM Canada documented 1971 455 HO, M22, 4.11 12 bolt car. NICE CAR and different.
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Very rare car, I would like to see documentation on the 4.11 rear...3.55 was the numerically highest gear available and have never heard of a factory car built with any thing higher.
FWIW, in '70-'71, the GT-37 was an option to the base T-37. Kinda like "the poor man's GTO". I believe all GTO engine options were available for the GT-37.
Either way, it's still a very cool car and would love to park it next to my '72 HO WW5 car.
Mike