My problems seem to grow!! Here is were Im at now the vibrating and another problem <I THOUGHT was the front end it has some type of wobble if ya will> Anyways I jacked the rear of the car up and took the rmp to about 3k and I fell the wobble something is out of balance. axle or axle bearing. I have had this car a part motor trans new floor pans, subframe connector roll cage and new strut rods bushings, control arm bushings, All new gaskets for the temp 289. So with the rear tires off the ground what would make it <wobble> i cant think of a better word...Drive shaft, axles bearings, I dont think its a rim/tire issue they just sat all winter. This is the other odd thing faster i go or more rpm the LESS it dose it almost like the more speed it will balance out some.