What would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?

What would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip slightly from 1st to 2nd, then more rough from 2nd to 3rd? We did a fluid and filter change and changed the modulator valve. It slipped before we did work on it but it doesnt do it as bad now. PLEASE HELP!!!!What would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?You need a transmission service. Sounds like they hydraulics are gummed up.What would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?
its time for a rebuild the 1-2 problem is the band that's worn the harsh 2-3 is forward frictions that are also worn there is some play in the drum that is giving you the harsh shift the new fluid has helped but will only last a whileWhat would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?Did you pull the pan was there a lot of grit and solids in the pan ? it this origanals miles ? or after a rebuild ?What would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?
check for leaks.. when transmission oil gets low, things tend to slipWhat would cause an 89 Ford Ranger v6 2wd with an A4LD automatic transmission to slip?old age and wore out.

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