13 speed...TOAST?? Any ideas...

This isn't a rear end problem boys. Mechanic yesterday confirmed both rears are fine. I was actually scheduled to have the oil in the trans & both rears changed this weekend. He said the oil from both rears looked & smelled really good! Plug had very little metal shavings on it. The front diff back in March got all new axle bearings & seals. Also just got a input shaft yoke & seal. The drop outs were rebuilt approx 300K ago. They were filled using industrial grade mineral oil. And that is what I will continue to use. Werner's entire truck fleet has run it in all their transmissions & rear ends since the 1980's! I have temp gauges for both rears & the trans. When this problem presented its ugly head, the gauges were reading "normal operating temps". Plus I will randomly use an infrared thermometer to verify all my temp gauges are reading accurately. As far as the clutch goes, it was replaced too back in March. Along with the flywheel being resurfaced. I had a premium "manual" adjustment clutch installed. Those "auto" adjuster clutches are GARBAGE!!! This is the 1st adjustment it has had. Which wasn't much. He also pulled off the inspection cover an said the clutch looks fine. Pedal operation is fine too. Oh yeah, he confirmed this is a trans problem by starting the engine, putting the trans into gear WITHOUT using the clutch & verified the drive shaft was not turning!!! The trans will get drained tomorrow, so I'll let you all know how that goes....

 

UPDATE: Transmission fix...er, uh... rebuilt, sort of. The main box was fine. Oil was dirty but had very little metal shavings in it. The problem was in the back box. The range shaft fork broke which cause the trans to be "stuck" in a neutral position. Mechanic took the whole thing apart & I'm glad he did!! Had 1 shot synchro, other 2 were not in much better shape, large bearing on the center shaft was history (Chinese part), the main drive gear on the center shaft had worn inner teeth as did the shift range coupler gear, and the 4 bearings on the 2 side shafts had some wear (again Chinese bearings). So $2500 later the back box is mostly all new.