look into the filter inlet to witness a stiff fabric or a screen.
The "stiction" is usually powdered metals and clutch friction powders, from normal wear.
Drawnback to dirty fluid is an eventual clogged fabric filter.
Story: i drove a cooked TH400 (in a GTO i bought) where the fluid was burnt dark brown with pepper specs and sure smelled burnt. Even went drag-racing to get performance data before swapping engine/trans. Well the FWD frictions were burnt and Direct clutches were completely burnt down to the metal yet the TH400 behaved as if it was fine. The rebuild went just fine, and surely got my re-programming to avoid burning anything but tires.
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