Re: GMC V-12 powered '91 Chev crewcab
As far as transmissions go, a split gear SM420 from a 60-66 GMC 2 1/2 ton truck would work, but I have NO IDEA how you would shift it if mid mounted.
The SM420 has the same bolt pattern as the v-12 since it was mounted behind thousands of 305 and 351 v-6's.
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