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Okay. Was changing rear diff fluid. Somehow lost the rear diff drain plug. It's not the same size as the front and dealership has been no help. I've looked everywhere for a replacement. I need to know what size this set screw is. It's small and on drverside bottom. #5 Allen wrench removes it and it looks like pipe thread. I have spent over $50.00 for different size NPT thread set screws with 0 luck. Anyone else run into this problem.
 

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In practice there is only so many combo's (diameter and pitch) that "Look" right, and with what you have spent you must have gotten the right plug, by now.

Most likely you have cross-threaded the diff. You need to look into cleaning up the threads with a thread cutting bit. Also called a Thread Tap. Sets are inexpensive.
 
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