1992 Toyota Previa

Transmission problem 1992 Toyota Previa 4 cyl Two Wheel Drive Automatic 1992 miles The trans is slipping, itll randomly gear down, at times often. Van was unused for 3 years before I bought. I changed trans fluid and filter, which reduced the slip but not fully. Should I go for a full fluid flush? It was really sludgy, oh, and one of the pan magnets was broken but I pieced it together
February 26, 2010.

A couple of questions to clarify. Was the fluid burnt and black with a lot of friction material? Also is the trans slipping (not up shifting and reving high) or dropping into a lower gear when it should not? Can you manually shift the vehicle and does it shift firmly when you do? Let me know!

Mar 7, 2010.