As I stated in my intro in the new member forum, I have been working on a '46 1/2 ton truck that has not run for many years. With guidance from a member, I was able to find a replacement rear yoke from North Western Transmission and get the drive line back together. I also replaced the rear transmission mounts, they were dry rotted and pulling apart. I thought after replacing those mounts, the clutch chattering that I have would go away but it looks like I need to remove the trans and investigate what is worn out. I have read stories to look for a worn pilot bearing as well as oil soaked clutch disk. I'll let you know what I find.