Well here is the deal. I was towing a trailer with a load of quads. Stopped to get coffee and got back in the truck and put in drive. I rolled on the gas and went no where! I would have to raise the RPM's to about 2000 before it seemed to shift into gear and start moving..but it was a hard shift. There was no signs of slipping prior to this. I do have a Factory Tech shift plate installed. I also noticed while driving home, i would go up a hill and it would shift down and instead of taking off it would run my RPM's up to 5000. (aka act like in neutral) Any ideas other than a rebuild???