I'm sorry, I haven't been on here in a few days. I switched the tires front to rear, Now the rear is wobbling, So one of the tires has to be bad! + the jerking in the steering stopped. It is 4 wheel drive. Also I unplugged a little square black box on the frame beside the transfer case & the thumping stopped & the 4x4 still works when I flip the switch.
Thanks for the help.