The issue got worse over the weekend after I paid a visit to my neighbor who lives on a long, steep gravel road. The transmission clutches got a workout, and apparently shed more fiber onto the OEM filter. Warm-up the next day was well over 4 miles.
I've decided to drop the pan again, convert the OEM filter into a pickup, and install a remote oil filter in the supply line of the cooling circuit. This will allow me to change out the filter on a routine basis as as better protect the transmission itself. I've designed the system to use the same filter as the engine.
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