1978 c10 manual clutch fork spring
 

Does anyone know what the part number is for the clutch fork spring. One end connects to the thrust bearing and the spring is on the other end of the fork holdind it back. LMC and dealer, ebay no help.

Are you asking about the throw out bearing (clutch release) that holds it onto the yoke?

I don't think that can be bought as a separate part. You'll probably have to buy another Yoke/Fork. As I recall, those spring clips are riveted onto the Fork.

PS:
I've always been amazed at Throw-out Bearings. Being able to be engaged at 7-8000 RPM repeatedly, and last for years. Gotta hand it to the designer/manufacturers... good job ;)