I'm seeking for someone who has knowledge of the 340 automatic transmission in my truck. Had an engine go south on my truck but transmission was great. Worked beyond my expectations. Loved it. I digress, during the swap I damaged the dip stick filler tube and it was leaking so I dropped the transmission pan and repaired the leak. Reassembled the transmission pan and filled the pan with new dexron3 fluid. Now the truck won't move in any shift lever position. It feels like it's in gear in all positions. In park and neutral it acts the same way. Rev the engine and it is under load. It will only rev a little over 2400 RPM. This is mystifying me beyond belief. Anyone who can help me will be appreciated more than you will ever know.