My 1991 350SDL W126 has 159K on it and recently had a major front end/steering rebuild. Now it will vilolently shake if I hit a goiod bump in the road right around 60MPH, the shaking can only be stopped if I hit the brakes. Work was done by a local MB trained independent. I took the car to the local MB dealer. They visually inspected the front end, they tell me the front end is fine and can't determine a source of the shaking.

Any ideas appreciated.

Thank you.