Easiest 727/904 rebuild thread...

Plymouth 65 said

I typically take the transmission apart and wash the casing and tailshaft housing with a power washer. Dry it off with compressed air. 65'

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Agreed and we'll get to that. For now I'm just giving some advice to the guys who have really grimy greasy Gopher guts all over their transmission to knock off the heavy crud first..
And at that a good $5 way to do it...