Muncie SM465 4 Speed Transmission

SM465 Transmission Specs & Ratios

The SM465 4 speed manual transmission is the transmission of choice in the off-road realm. Used in a variety of GM pickup applications (both gasoline & diesel), the SM465 is rugged, heavy duty, has a granny low 1st gear, and is simple in design. Replacement and upgraded parts for the transmission are widely available due to its popularity and availability. Like all 4 speed transmissions used in diesel applications, the SM465 was eventually replaced in favor of a 5 speed overdrive gearbox.

SM465 Transmission Ratios

1st

2nd

3rd

4th

R

6.55 : 1

3.58 : 1

1.57 : 1

1.00 : 1

6.09 : 1

 

SM465 Transmission Specs

Transmission:

Muncie SM465

Type:

4 speed manual transmission

Manufacturer:

Muncie

Model Years/Applications:

1982 - 1991 6.2L Detroit/GM diesel powered pickups

Synchronized:

Synchronized 2nd, 3rd, and 4th gears - 1st and reverse gears are not synchronized

Case Material:

Cast iron case & top cover

Case Length:

12.00"

Max Input Torque:

465 lb-ft

Weight:

~ 175 lbs

Fluid Type/Spec:

50w or 80w-90 non-hypoid gear oil

Shift Pattern:

SM465 transmission shift pattern