I just got a 95 tbird and when my speed gets to about 35 and around 70 mph, the car shutters. It also happens, it seems, when I go over small bumps in the road. It seems to be coming from the rear of the vehicle.
Most likely a strut problem
Could be a strut, but check the pressure, balance, and tread of the rear tires. Always look for the simpler, cheaper solution before assuming you have to do expensive work.
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