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After a little more searching and it seems to be refered to as a lube cup orifice.

Quoted from another forum. "and 2wd needs the oil plug swaped out on the 3 oclock position with the tail housing off. 4wd needs a solid plug. 2wd has pin hole to lube the bearing in the tail housing. "

It didnt happen. Whent to my local trans shop to pick up the parts to do a rebuild and conversion he told me about the plug. He was the one that said it would cause problems and fill the case if not changed out and had the plug to give me. Like I said it was 8 years ago and I have trouble...

I have done a 4L80 2 wheel to 4 wheel conversion and also bought no specific tools. It was about 8 years ago so not sure on the specs you are looking for. The one thing I do remember is that there is a plug between the case and tailshaft housing. On a 2 wheel drive there is a pin hole in it...