From JeepTech and JeepTech Publishing LLC, the Jeep knowledge base.
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The SM465 is a heavy duty, granny, 4 speed transmission used in Chevy and GM trucks. The large ribbed cast iron case makes it easy to identify.
It is an excellent 4 speed to swap into a Jeep with a Chevy engine. The SM465 has an unusual large input bearing retainer, it does not use the standard GM size. It is normally best to buy a matching bell housing with the transmission.
Rumor is, the late 70s to 81 GMC trucks were available with a Oldsmobile 5.7L diesel and SM465. The bell housing used in this truck would be useful to mate an SM465 with a Buick engine since this engine should have the BOP/BOC pattern. The other option to mate a Buick or Caddy engine to an SM465 is get a BOP/BOC bell housing machined out. This adds to the cost and who knows if it would compromise the strength of the bell housing.
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GNU Free Documentation
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