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They stopped putting the sm420 tranny in in 1967. I have never seen on in a newer truck factory. The sm465 was used into the mid ninties with heavy duty trucks
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!
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