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Old 09-24-2019, 09:33 PM   #15
Daves55Sedan
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Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
Default Re: Just rebuilt transmission

The dipstick tube connection to the pan IS your drain plug. The Mercury medium case Fordomatics did have a drain plug besides the dipstick tube, located near bottom of the front of the pan, but the medium case pan is not interchangeable with the small-case Fordomatic pan.
If you decide to add a drain plug, be careful to locate it such that it will not interfere with anything just above the pan. It is very close quarters an many spots.
I suggest using a half-coupling and pipe-plug. After drilling the proper size hole, have a pro continuously weld the half-coupling in place and be sure to check for leaks before installing.
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