If the problem seems to be more persistant when trans is warm,,,,,shift accumulators may have broken cushion springs,,,other issue would be seals on accumulator pistons worn,,,,by replacing seals on pistons and buffing the bores with "scotch-brite",,,will get it back on track.......also fill this trans to "full" + one quart,,,has a very shallow pan,,,under certain conditions transmission will starve for oil,,,,,will not hurt trans ,,,it will thank you!!!!