Quote:
Originally Posted by Cammer-6
any idea how many GT-37s with 455HO and 4speed were made?
Im guessing 3.90 rear?
Did you save the old exhaust for patterns and reference?
Production of the '71 & '71 1/2 GT-37 equipped with the 455HO engine was 54
Long time associated production numbers by trans selection are estimated at:
34 Manual (M13 HD 3spd & M22)
20 Turbo 400
3.90 was a PONTIAC 8.2 10 bolt HD STT ratio in '71 & very rarely ordered in '71 Pontiac 400 4bbl performance A-body's (typ behind an M22).... 3.90's not factory avail in the 12 bolt. McKinnon assembled 12 bolts installed behind factory installed 455's & 455HO's in these cars carried either a 3.07, 3.31, or 3.55 gear ratio. Don't believe a documented airconditioned T400 '71 455HO T-37 or GT-37 has been discovered as of yet. Auto AC combination is where a 3.07 gearset would have been used.
Early owners that were class racing or local racing often had 4.10 or 4.33 gearsets installed as they were running much taller rear tires, often 29.5" tall 15" slicks. These owners also often converted their manual trans cars to T-400's or to 2.88 1st gear Power Brute T-10's.
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