i install a 4" lift today and at the end went to install transfer case lowering kit, when it can time to take that skid plate off 4 of the bolts came out fine 2 the bolt just spins the nut inside the frame is just spinning and there is no way to get to it any suggestions
i would cut a hole in the frame but only big enough to jam a screwdriver in to stop the nut from spinning start smaller and go bigger until you can get it. just my opinion you could also try jamming somthing under the bolt to force the nut to grip from the inside. it's a tuff one without being onsite. best of luck with it. also if your that worried about the hole causeing a weak point you can always weld it closed. yep that's what i would do cut a hole in the side then while you have your welder out weld the nut back on then remove the bolt then weld the hole colsed. done and done.
besides cutting holes and other things you can also spray a bunch of PB blaster up there. then hit it with a hammer, let it sit and then spray it some more. You may want to try to use an air impact to get it off. one of the bolts on my TRE wouldn't come off because it just kept spinning. I put my air impact on it and it took a while, but it finally came out. I changed my tierod and ends in the parkinglot of my dorm. I got a lot of weird looks. I love OBA
Are you letting the weight of the skid pull down on the bolts? That should help. This is a common problem. If/when you do get them off, you can thread a nut on the bolt, thread the bolt into the frame, and then tighten the nut against the frame and then tighten the bolt. I've heard that helps seat the rivnut.