every now and then (about once a week), my rebuilt e4od, when cold, has an erratic first to second shift, bangs pretty hard, OD light flashes, I turn it off and restart it it, it resets and works fine, no more flashing light. It then has no code. One thought was the filter inside being loose, that wasn't the case. My previous trans use to do this and it always had a solenoid malfunction code. Two different shops checked it for codes with nothing but a glow plug malfunction on one bank. Any ideas? Could it be some sort of electrical problem outside the transmission sending faulty info? Thanks Don.