According to the transmission write-up over at The Ranger Station, some Rangers came with torque converter drain plugs but it didn't specify which ones. I didn't even know that was a thing! Anyone know if mine (5-speed auto) has one?

 

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I do not think the 5 speed autos have a drain plug.
Easy way to check is to pull the inspection cover and turn the crank with a wrench.
Spin it 360 and see if there is one there.
My 2005 does not have a drain plug in the TC.