1981 - 240 wagon, When I am making a left hand turn at low speed and hard on the throttle there is a loud puonding noise that seems to come from the front right corner of the car. If I am turning left not hard on the throttle there is no noise. I replaced a motor mount cause it was comming apart & I thought that might be the culprit, nothing changed. I looked at the exhaust to see if it was banging on the frame somewhere but could not see anything. My ball joints are a little loose but not too bad so I don't think it is them. It only happens when I am standing on the gas pedal & pulling into traffic or some similar manouver. I had a mechanic look at it but he could not find the scource.

Any Ideas?????

Thanks

Steve