Boadie
Guzzler of the Coors
Went out last night to look at a truck for a friend 6.0, 2005, F-250, SB, AUTO. I notice while he test drove it from a dead stop he would start going at a normal rate it would shift three times and just after the truck shifted the third time I can hear and feal a slight, single knock from under the seat. We could not duplicate the sound at any other time. If we got on it a little faster it would not do it. Almost every single time it would do it just after the 3rd shift at a reqular rate of speed. Any Ideas? 
