IdahoDoug

That's what the 80 is known for - long term service. Drove ours with 312k miles across the USA a year ago.

Dirtbike - respectfully disagree. Those pits are deep and your strategy will have the pits go right through the metal and begin leaking sooner than you'd think. Simply filling them with an inert substance designed for permanent life underwater...

I've dealt with this a couple times over the decades, including the 80 - same pipe. Coolant gets under there and goes acidic (or base?) despite changing the coolant properly. Fix it by cleaning it thoroughly, degreasing, and laying a thin coat...

Any further input here? I found an 85 front bumper and wondering if it will fit regarding frame width/mounts, etc. Were there any changes. Also it's on a 4WD and mines a 2WD if that's useful. Thanks