This is a new nos gm in old original gm box crank shaft gear shows as fitting chevrolet cars and trucks and gmc trucks in the 1937 1938 1939 era gm part # 838432 shows 27 tooth and 3 1/8 diameter and 6 cylinder engines
listed as fitting
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1937 1938 1939 chevrolet and gmc car and truck All with 6 cylinder engine
