I made some more progress this past weekend. After spending a few nights with my angle grinder with a wire brush mounted on it, I quickly decided it was going to take me forever to clean up the entire frame. So this weekend I took it to a DIY sandblasting place and it only took me 40 minutes to do what would take hours with the angle grinder. Getting the frame out from under the cab was a bit of a chore however as I had to remove the rear end to get it out from under the cab, put it back in to haul it to the sandblasting place, then repeat the process when I got back home.