Thanks for taking the time to post the pictures Red. I'm going to be picking up the material at the end of this week but I still need to decide about either removing the fuel or dropping the tank. So the repair won't be this week. Still gathering info.
Thanks again.
Glad to be of help. I did remove my body mounts all around and raised the body a few inches. I did this mostly to clean and paint the frame and underside. If just repairing the #4 mount, it can be done with the other mount bolts untouched. If you need to slightly elevate the rear of the body to shim correctly, place a piece of plywood on the underside, after removing the fuel tank. This will give you support to jack against and raise the body slightly from #3 mount back. It worked for me, without damaging my lacquer paint or anything else.
The fuel tank will come out easily after draining or pumping fuel out. The later model C-3 with the vapor canister are a PITA trying to undo the lines at the top. My wrists are small, so I snaked my hands in there and was able to undo the hose clamps. After that you are good to go. BTW...you won't need to remove the fuel tank when welding, if you provide a good barrier between the welding stinger and tank. The heat from the welding area won't hurt anything, it is accidentally arcing a fuel container with the welding stinger. If you create a good barrier from the tank and fuel lines, you will be OK, but a personal choice.