When I add posi I go with Auburn Gear or Detroit Tru-Trac, meaning go into rear end work. The trucks with factory posi I have run either came in the truck or I swapped whole rear. I have a later 3.42 posi to install in my '67 hot truck project and am now considering 3.73s and Tru-Trac behind the M22
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Originally Posted by Casper42
according to the 1972 Truck Price and Facts book, the K10 with 350 engine came with standard 3:07, optional 3:73 and that's all. Perhaps "special order" one could get other gears
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That can't be all the information. It would depend more on what transmission the truck is equipped with than the engine. 3.73:1 was the most common in manual trucks (standard) with 4.10 being option). The TH 3.08 trucks came through with 3.08s with 3.73 & 4.10 being options.
This '72 I had not nearly long enough had a 292/4spd/4.10s/fr & rr posi, all listed as options
This '72, also owned but a short while, had 350/4spd/3.73/posi rear, all but 3.73 were listed as options