I also have the same problem.  The car will shake slightly around 65-75 mph.
My car also has the same tires up front as in the back.
I have heard that it is possible that this will occur if the wheel nuts are not put on with the proper torque.
Weird thing is that sometimes it is more pronounced than others.
Last edited by GeoPappas; 08/20/02 06:30 PM.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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