I am right in the middle of trying to put on my skid row skid plate but to do this, I need to remove the tranny skid. The big bolts holding it to the frame are just spinning. So, I assume my weld-nuts are loose, any ideas?
There is one small one, kind of oval shaped, but not big enough for a wrench. It was big enough to stick my finger in (partway) and point the nozzle of my penetrating oil can there. Got it soaking as we speak.
I drilled and pinned mine when they broke loose. Took only a few minutes after I figured out what was happening and what I needed to do.
The one I had a bolt hanging out of was a bit harder to fix. I ground down my vice grips until they were thin enough to grab the head of the nutcert, got the bolt out, then went back and pinned the cert.
I don't think I've ever dropped a belly when at least one of the weldnuts didn't break. Even on near new rigs, they break off and spin.
Some people make such an easy thing so complicated - some even cut a big hole in the frame to access it.
Since I don't like to fiddle around, I simply cut the spinning bolt's heads off with a 4 1/2 grinder, torch, or plasma cutter.
The pan will drop off, leaving the studs hanging down. Whack those studs with a hammer - they'll fly up inside the frame somewhere, never to be seen again. Now the hole is clear. If the weldnut was spinning, the weldnut goes flying with the bolt, so the inside is flat again.
When putting the pan back on select a bolt the right length and size you want.
Weld - or JB Quick Weld - length of weld rod or coat hanger to the heads of those bolts.
Simply sneak those bolts in though another hole in the frame somewhere till it protrudes down the hole you want it in. There are big enough holes both in front and in back of the belly pan area. (Tips - mark the rod the length you'll be going in, sneak it in till you see it through the hole, then pull it through the hole with a small magnet.)
When you tighten it, the bolt head will jam against the remaining weldnut pieces inside so it won't turn. An impact works great. If you ever take it off again the rod you put on is usually enough to stop it from spinning.
Simple, easy, fast, and costs near nothing.
It's no wonder the country is falling apart - stupidity abounds!