shimy?
my truck, around 40-50 mph, has a really anoyying shimy i guess you could call it. it feels like the back of the truck is moving up and down really harsh. shakes every thing in the cab. almost like a tire thats not balanced. yes, thier balanced, internal with beads. it does it when braking and acclerating. could it be a u-joint? i checked them and all were tight and not worn. could a warped rear rotor cause this. that would explain it on braking but not on accel. ideas?
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