Got a problem that just propped up recently. I am experiencing a very Hard Jerk/Shift into First Gear, Second Gear almost non-existent. Recently I had just changed out the Transmission Filter using a gasket set, I over filled the Transmission when all this started and since I was under there I went ahead and replaced every thing in there and gave it 4 Quarts of Dextron III Transmission fluid. Maybe a Rebuild will have to be done? Hard Shifting seems to be only in First and Second if Second will shift.