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The transmission was running fine when I rebuilt it, just leaking at the front seal that turned out to be a badly worn front bushing. It was perfectly clean inside with nice red color to the fluid. I didn't disassemble any of the major components like he did, just the clutch packs. Since the problems are repeatable and due to temperature it's obvious that viscosity is playing a major role. Maybe some clutch pack material stuck itself to the band clutches and has changed the friction characteristics. I think now that the packs are broken in and I have a 20-ish micron filter on the system the warm-up issue will go away with miles as the material washes out of the bands.
No need to spend a lot of time and money re-rebuilding it until that theory is debunked.
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