Hello,First time here looking for help.
Subaru impreza 2lt non turbo sport wagon. Drives fine generally until travelling 10miles at a steady 70 to 80 mph then develops dull knocking sound which turns into a violent shuddering of the whole car, After a brief stop everything is all ok?engine in good order,tyres all new and balanced goes into and out of gear fine.
Can anyone shed light on this please.