Re: GMC Medium Duty Flywheel Size SAE 2
Checking my parts books, the best that I can come up with without physically seeing your truck is that pickup truck and medium duty applications up to 1974 6000 series all use the same ring gear. That would tell me the flywheel diameter is the same for the 351C but there are 12 and 13 inch clutches so the flywheels are drilled differently.
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