Here is my rear diff NIGHTMARE. With a good ending:
I went to drain my rear diff a few months ago. The drain plug came out rough, and it pulled a ton of threads out with it. The previous owner's mechanic over tightened it.
I proceeded to buy a very expensive Time Sert kit. I work at a performance shop as a mechanic. I got this. I had 2 of the best people I trust watching me drill and tap from all angles. They said "you're good bro, send it." Well, I wasn't good bro. The time sert was drilled/tapped SUPER crooked. Now my diff is leaking very slowly. Drip...drip.
I let it drip in front of my house for a couple of months. Unsure of what to do. Do I weld the hole closed?
Another Co-worker gave me the idea to install an NPT pipe thread plug. The next size up was a humongous 3/4 inch plug.
So I drilled/tapped for NPT. I used a drill guide this time, to make sure I was drilling flush. By God, my diff is fixed, sealed, and it drains super fast now, lol.
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