If this happened right after fluid exchange,you may not have enough fluid in trans. On my SD it takes a while for fluid to run down the tube,to get a accurate reading on dipstick.Which can make you think pan is full.Now there are some things that can go wrong in the trans that can be repaired if car was driving before this.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt