Shakes or Wobbles problem
1999 Volvo S80 6 cyl Front Wheel Drive Automatic 110, 00 miles
From a standstill, during rapid acceleration my car shudders just for an instant as it changes gears, but during normal acceleration there is no shudder. Also, when going over dips on the highway at normal speeds there is the same shudder, but once I accelerate it does not happen at all.
If you have a shudder during a gear shift then your transmission fluid is contaminated with coolant. You would need to have a glycol test done on the fluid. If it is contaminated then you will need to replace the transmission, radiator, and transmission lines.