Lets see if I can post a picture. This first one shows the plug location. The casting wall is thin in this area and has to be a pipe thread. I do not recall the size right off hand, but drill the hole at the smallest size of the range for the pipe threads or the plug could go all the way through before the taper stops it. The plug is directly above the inverted ZF logo and I am thinking it is 1/8" NPT.
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