Re: GM Semis
Yes, the 4-53 was available in Chevy and GMC C series mediums from 1978 to about half-way through 1980, when it was replaced by the Detroit 8.2L. There was a lumberyard near me that had a few C-6500's with 4-53T's in them. Man they were noisy, sounded like they were going about twice as fast as they actually were.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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