Is your clutch hydraulic operated?
Are you familiar with the term free play?
Nope, manual clutch. And yup, the clutch was properly adjusted with acceptable free play.
Finally got the other trucks taken care of and was able to break this girl down again yesterday. Sure enough, the clutch was 100% slipping. The TO bearing was too long and never let the clutch fully seat even when released. Lots of wear present on the fingers. Problem number 1. Problem number two, the clutch fork (not pictured below) was worn out pretty significantly with a lot of play on the TO bearing. Problem 3, during the rebuild with everything else happening, I overlooked the flywheel and didn't get it resurfaced. Totally forgot to even check it. It needed surfaced.
I wont even bother with this stock flywheel. It is so badly burned the hard spots will never get removed and the depth of the grooves will have it out of spec just to get it smooth, so to the junk pile it goes. All led to the photos below. Lesson learned the hard way on my part. New clutch fork and flywheel on the way and a new level clutch with proper TO awaiting the flywheel for install.
This means the clutch has slipped from day 1 of the rebuild, so once its reassembled, I am excited to see how much more umfph this girl will have off the line, because she was already a beast.