I have a problem with my truck that is driving me crazy. This problem did
not start until I had the rear brakes replaced, there is a shimmy when
driving between 60-70. Before 60 you don't feel it and after 70 it lets
up.

They have ruled out brake drums, said it was the left rear axle, that has
now been replaced. Problem is still there. Tires were new put on about
2000 miles before brakes redone. (apparently rear brakes were hard and not
working properly, wore a grove in drum, both sides bad.)

Any suggestions would be greatly appreciated.