trans wont shift from 1st to 2nd or 3rd to 4th

[jayreb250]

thanks again guys!!! I really appreciate your help. I wil replace the sensor and do the stall test. Didn't you have a post on doing the stall test somewhere, I think it is in the book but just so I will have another source to go by.

 

[Brain]

This is probably the most clearly I've written the stall test steps (about two-thrids of the way down the page):
http://www.explorerforum.com/forums/showthread.php?t=113199&page=2&pp=20&highlight=stall+test