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Re: GM Semis
Starting for the ‘60 model year, GM did the 4x4 in house on the 1/2 and 3/4 ton trucks.
Prior to ‘60 it was a NAPCO conversion.
It was also a NAPCO conversion on the 1 ton and heavier trucks from ‘60 until???
GMs first in house 1 ton 4x4 was 1977.
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'46 GMC---355,TH400, 9"
'66 K20---350, SM420, T221, D44, HO72, 4.56
'87 K30---tbi 350, TH400, NP205 twinstick, D60 powerlok, 14ff Detroit, 4.10
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