I have a tubbed 57 chevy that I recently bought a set of Mickey Thompson radial tires for, and have had nothing but problems since. The rear tires are 22 x 33 x 15. When I accelerate, the car begins to rock from side to side so severely that I have to get out of the gas. When I put my bias ply's (21.5 x 33 x 15) back on it drives straight as an arrow. Has anyone else experienced similiar problems? Any insight into this issue would be greatly appreciated.....Thanks.