What is this frame bolt for?
Posted: Sat Sep 17, 2016 1:35 pm
The ol' memory not being what it used to be, and too much time elapsed since I disassembled this part of my truck, I can't recall what, if anything, the bolt circled in red below is for? It's on the right frame rail, aft of the front running board bracket and just forward of the front transfer case crossmember. With the external tooth lock washer, it looks like it should be for something electrical like a chassis ground, but it's tucked in on the right frame rail inboard of the muffler. The small bolt above it is for a bracket on the inside of the frame rail that holds the wiring harness.
I took photos from when I did the disassembly (see below), so I know what it looks like, but I can't figure out what it's for.
Any ideas?

I took photos from when I did the disassembly (see below), so I know what it looks like, but I can't figure out what it's for.
Any ideas?