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Re: 64 GMC stepside
With the SM420, SM435 and SM465 four speed transmissions, 1st gear is not intended to be used in everyday driving. You start out in 2nd gear, so you basically have a 3 speed trans. First gear is used when low speed crawling or pulling power is needed. I see no reason a SM420 won't hold up behind a 400hp V8
For a frequent driver I have to agree that a 5 speed manual or a 4 speed auto OD trans makes more sense.
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