1937-48 Chevrolet crankshaft gear 839259 is listed in Chevrolet parts book to be used with 838436 camshaft gear.
838436 camshaft gear is listed for 1937-47 all and 1948-53 all except 2 ton.
Together the gears are what is original for all 1937-48 Chevrolets.
The camshaft gear has 838436 imprinted and 839259 has GM engraved.
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