If you have enough junk to clog a filter, you got more going on inside there! I’m with guitar... I’d be pulling the trans with a pump and converter in the budget.

Btw.... the “check valve” in the outlet line on those trannys only purpose was to prevent converter drain back so customers wouldn’t complain of slow engagement after the vehicle had been sitting an extended period of time. In the days of old the owners manual and service information directed you to start the car in N so the cooler system would charge. I drilled the one out of my 01 47re.