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Re: 67 4 speed torqe capabilities ?
the sm420 was even installed in big school busses in the day so they are tuff. But no way are they a fun tranny unless you like 4x4ing and going slow. But I like that to.
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I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!
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