What I don't get is that if it were something in the driveshaft, rear end, rear tires, why would it go completely away in overdrive? All that spins the same speed at the same mph no matter what gear you are in...
I haven't used the lock-up converter hardly at all. Both the overdrive and the lock-up are actuated by a pair of switches which grounds one of those wires from the trans when pressed. No computer or automatic engagement of any kind that I am aware of...
