Part Number Help, please?
 

Can anybody out there tell me the original GM part number for the input (or clutch) shaft for a 1965 SM420 transmission? I'd be much obliged for the information.

Re: Part Number Help, please?
 

Welcome lhtex120

One number I have is 3761928-main gear drive. Not sure if its for 1965 but is stated as the SM420.

Re: Part Number Help, please?
 

Thanks! I am looking for the part number for what we used to call the pilot shaft (the one that sticks out of the front of the transmission and goes through the clutch plate). I have searched high and low and cannot find an exploded view with part numbers. According to Novak the 1st-2nd synchro ring is aluminum in the 1964 to 1967 SM420s but I am not sure if that affects the pilot shaft. They may be all the same? One number I was given was 3787253 but I was trying to confirm that.

Re: Part Number Help, please?
 

The parts book is 1960 GMC Master so that may be the difference

Re: Part Number Help, please?
 

Funky61, Thank you very much for the information. I appreciate you going to the trouble of finding this information and posting the pictures. -LHTEX120