Hi Oldblue,
The bucking stops at 20 M.P.H. and the transmission is a 3 speed automatic with overdrive. At 20, I should be in at least 2nd by then. Strange as it may seem, it doesn't buck in reverse. Drivetrain? Sounds plausable. With my truck in neutral, no bucking. Only when under power and I try to move.
I checked in with my mechanic. He disconected the EGR vacuum hose and told me to run it for a few days to see if anything happens. I haven't tried it out as yet.
Many thanks for your reply,
Woodster