I bought a 1990 626 with a slipping 4th gear on the auto tranny. I pulled it and replaced it with a used tranny from the junk yard. Well... the problem with this one is when the car is cold the tranny shift from 1st to 2nd fine, but when it tries to go to 3rd it seems to hit neutral(not slipping) and will not go into gear until I let off the gas and coast a second or two and then press the gas and it goes in third. Now the funny part is when the car has been driven for about 20 minutes it shifts fine. I has a new filter and I have change the tranny control unit(EC-AT). Also no codes on the computer. Has anyone heard of this problem? The tranny is still under a little warranty, I'm hoping I don't have to pull it back out.