One thing I do have to disagree with you on, Bill. There was an option for the hydraulic clutch on the 4x4's. My dad has a '63 Chevy with the hydraulic clutch, but from what I understand and have read in Chevy manuals, that was the last year they were used. Most say they were not used past '62, but that is not entirely the case. I will say that it is tough to find anything past '62 with the hydraulic clutch. I agree with you in that on this particular truck the bellhousing/clutch probably helps point to a '60-'62 vintage on the chassis/engine.
Tazshido, you will want to get the numbers off the engine and possibly even the frame to see what year those are exactly. This truck is pieced together and that is the only way you will find exactly what all you have. The cab is a '66, but that engine is definitely GMC and if it looks like it hasn't been monkeyed with on the frame, the chassis would be '60-'62 GMC. Good luck on getting those perches fixed, not much you can do with it until that is taken care of.
