Rear End Hop
I have a 2006 F350 6.0 CC LB with 120k on it that I bought it a few months ago from original owner. It has a very consistent rear end hop between 40-45mph (at lower rpm). I can accelerate through it, and it practically disappears under hard acceleration.
Previous owner had a Diablo tuner, but that came off immediately after I purchased the truck, and I have been running OEM since (want to go with SCT customer tune but waiting to solve the Hopping issue before spending more $). I replaced all fluids and filters, including differentials, (Amsoil and K&N) and a new FICM, and 2.5" level spacers. Motor is strong and smooth.
First thought was tire balance, so that has been done along with rotation in case one tire had bad belts, et. Problem not solved....thought perhaps oem shocks the problem, so I replaced all four with appropriate size to accommodate front end level kit. Problem not solved.
Not sure where to look next, anyone else experience this in the past? Not looking to spend a fortune chasing ghosts...any help would be greatly appreciated.