I have this weird problem. My transmission shifts fine if you leave it in drive or overdrive...goes through all the gears and downshifts when you floor it. The issue is if your in drive and manually shift down into second gear...it won't downshift into second gear unless your floor it...but the moment you let off the gas pedal it goes back into third gear right away. Also if your in first gear and shift up into second gear manually, it will stay in first and never shift into second. Shifting into drive from first will make a 1st to 3rd shift. I have had three transmission guys look at it and they all say it looks fine. Any info and ideas on this would be helpful. This happened right after a got an overhaul kit and new seals done on my car (transmission fluid was leaking from pan and from back seal).