Hi, I have a 1995 2500 with the 5.9/nv 4500/np241. This is a new truck to me, and I'm not sure how thick this frame was originally. what is left seems solid, just don't know how thin is too thin.

 

Looks like it's just scale. No big deal, considering its age. So long as you can't poke a screwdriver thru it, it should be ok. I would consider coating it with something though, and take a long, hard look at the brake line going to the rear. They are famous for rusting out, and breaking. Unfortunately, they usually do that behind the gas tank, where you can't see it. If the parts of the line you can see look original, replace it.

 

what should I coat it with that would be cost effective and work well? I'll have to check the brakes out

 

Check thoroughly that crossmember on a first picture, might be worse than it looks. Fuel tank strap mounts to it, so it better be in good condition. Even though the frame on my truck is not that bad looking, that crossmember is beyond repair. I've already patched it once, but now I have to build a new one. Also check the rear suspension, especially rear hanger and the mounting bracket for it.