GM SM465

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.

Transmission	1st	2nd	3rd	4th	5th	Rev
SM465	6.55	3.58	1.57	1.00		NA