Anyone have any expertise in rebuilding a Whirlpool Direct Drive Transmission. I have many Transmissions that recently have come into my shop with Bad Transmissions that are GRINDING. Anyone ever rebuild one other than just change out the Neutral Drain or Agitator Cam and if so what is causing the GRINDING inside the Transmission. I can very easily swap out with a NEW TRANSMISSION (Part # 3360629
) but am curious what causes the Grinding (specific part or parts)??