Help with 4 speed transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Kutzy · 10-23-2011, 10:10 PM

Hello, everyone!
I am in need of some help identifying the transmission in my truck.
The truck is a 1980 GMC C1500 and it has either the 305/350 V8 and a 4-speed manual transmission.

According to Wikipedia, it is either the Saginaw SM465 or a New Process overdrive transmission, as these are the only 4-speeds that came in this year/model truck.

If it helps, the shift knob has an H pattern for 1-2-3-4 such as:
1-3
2-4-R

And from what I can find, the SM465 has a L-1-2-3 pattern, unless the knob was changed.

Are there any specific features I can look for on the transmission that will help me identify the model?

I appreciate any help that the educated members of this forum can provide.

10-23-2011, 10:10 PM	#1
Kutzy Registered User Join Date: Oct 2011 Location: Las Cruces, New Mexico Posts: 29	Help with 4 speed transmission Hello, everyone! I am in need of some help identifying the transmission in my truck. The truck is a 1980 GMC C1500 and it has either the 305/350 V8 and a 4-speed manual transmission. According to Wikipedia, it is either the Saginaw SM465 or a New Process overdrive transmission, as these are the only 4-speeds that came in this year/model truck. If it helps, the shift knob has an H pattern for 1-2-3-4 such as: 1-3 2-4-R And from what I can find, the SM465 has a L-1-2-3 pattern, unless the knob was changed. Are there any specific features I can look for on the transmission that will help me identify the model? I appreciate any help that the educated members of this forum can provide.



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