get under the car in neutral, with the hand brake on, and check how much backlash it has by tuning the tailshaft your ment to have a bit, but if it turns more than a bit of a wrist action your best off pulling it out, and adjusting the backlash, or quickly pop into any diff shop and ask them to check it and adjust it.. don't keep driving on it if your not sure.. 4.3's arn't the easyest to come by!