"...describing it as being due to loosened fibers from disintegrating "clutch packs" — caused by coolant mixing with tranny fluid. "
We must have read the same post, because that is exactly how I envisioned the cause of a clogged screen.
Just supposing... just imagining... if that was a discovery on my car, I think I'd pressure test the radiator to test whether there was the possibility it was sharing the engine coolant with the transmission oil, even if I had already planned to replace the radiator. That heat exchanger is made of very thin metal, and it is the only support (i.e. backup or counter hold) for the flare fittings on the transmission cooler lines.

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Art Benstein near Baltimore
Wear short sleeves! Support your right to bare arms!
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