Piston Slap: Lubeguarding Against Ford Tranny Shudder?

Dan R writes:

Hello Sajeev,

I have a transmission related question that I was hoping you may be able to assist me with. I have a 2003 Mustang GT, 4.6, Auto. 110k. (3rd owner) The car has the occasional classic Ford “AOD trans shudder” at lower RPM under load.

It does not really affect the overall drivability of the car but is an annoyance and I’d like to take care of it. As far as I know this car has never had a trans service done. I’ve heard mixed reviews on weather to do a trans flush or not.

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