I just pulled my friends truck off the mountain! He has a 2001 Powerstroke automatic transmission. He was pulling trees out in 4 Low in reverse but then was unable to move forward in D, 2, or 1. If he revs the motor to about 3,500 and lets off it will move forward about 2 inches when the RPM's decrees to around 2,500. The Tranny was rebuilt about 35,000 miles ago and he had HD clutches put in and HD torque converter. He would like to know if anyone might know what is wrong with the limited info I gave. Thanks for the help!