SO.. Yesterday I installed a new trans in my 97 went for a test drive and everything worked great. This morning i started the truck, rechecked fluid level, and went for another drive, converter locked up at about 15mph and wouldn't unlock. if i keep it in 1st or 2nd it stays unlocked but soon as i put the shifter in D it locks up and wont unlock. my snap on scanner wont communicate and i gave up. trans shop is closed today so i figured i would post hear and see if anybody has any ideas? thanks
Jake

 

Hey, nearly 10 years later I’m having this identical issue!

Any chance you remember what the resolution was?