drain plug for 8 3/4 housing

You can get an aluminum 1/8" allen plug if you were really nervous about stripping it.
Just found another good reason for the drain plug, after flushing, I looked in there with a mirror and flash light. I am changing out my worn out cone for a new Yukon clutch sure grip. You would be surprised, gasket material, silicone and the known metal material or debris. After flushing, running a magnet around the weld seams where metal was caught, I then went over it with the shop vac. It's as clean now as it's going to get.