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SM 465 Transmission

SM 465 4 Speed Transmission Specs & Gear Ratios

 

 

 

SM465 4 Speed

The SM 465 4 speed manual transmission is an industry favorite in the Offroad community. Used in a variety of GM truck applications (both gasoline & diesel), the SM 465 is rugged, heavy duty, has a granny low 1st gear, and is simple in design. Replacement and upgraded parts of the transmission are widely available due to its popularity and availability. Like all 4 speed transmissions used in diesel applications, the SM 465 was replaced in favor of a 5 speed gearbox.

 

SM465 Ratios

Gear:

1

2

3

4

R

Ratio:

6.55 : 1

3.58 : 1

1.57 : 1

1.00 : 1

6.09 : 1

 

SM 465 Transmission Specs

Transmission:

Muncie SM 465 4 Speed Manual transmission

Manufacturer:

General Motors (Muncie)

Production Run:

1982 - 1991 GM diesel powered trucks

Input Torque Rating:

465 lb-ft

Transmission Weight:

Approx. 175 lbs

Additional Specs:

• SM = Synchro-Mesh.
• Cast iron case & top cover.
• Toploading 4 speed reverse.
• Gears 2, 3, & 4 are synchronized; R & 1st gear are not.
• 12 in case length.