Th350 slips at full stop.

[texasfunk]

try some trans x, its pretty pricey but CAN work miracles, stopped the slipping on my 93, and on the pan, next time you rplace the gasket be very careful not to over tighten the bolts or you will crack the gasket, and also befoe hand, get a hammer and dolly and flatten the bolt holes, sometimes with tightening it turns them into a small "crater" and it will also cause it to leak, hope this helps!