Yes, really dirty oil filter = lots of friction material in filter = trans is likely beyond saving. A filter change might restore some function, but it's on the backside of life.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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