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 |
|---|