I have a 2003 with the 48re. It has been locking up to early in third then seems to shift to 4 being locked before it lets go a second then locks up again. The video should give everyone an idea of what its doing but it doesnt show how it lugs it self in 3. I have checked for codes and have nothing.
http://www.youtube.com/watch?v=AKDLT...ature=youtu.be

 

Appears to be a shuttle shift. I would replace the Pressure solenoid and transducer with the new upgraded ones and see how it does.

 

I will have to give that a try then. Thanks for your help.