Thats the same thing my van was doing a cople of month ago. Only difference was it wouldn't start slipping until about 50. List of parts that had to be changed-
Torque converter/ pump
All the bands
Valve body
Shift kit
Sun gear
Basically everthing inside the housing. Your torque converter is slipping causing you pump to not pump enough, not enough pressure on the bands let them slip and wear real quick, also not enough flow from the pump lets your tranny overheat. Your fluid will be shot and doing no favor to your tranny. Sucks, auto trannys are way more expencive to get rebuilt than manuals.
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