[67ChevyRedneck]

The back bolts are underneath the gas tank enclosed with metal tabs pushed down around them. If your truck is not too rusty and the bolts will turn easily you can reuse the nuts (that's what I did), otherwise, I think you have to pull the gas tank to get to them. The front ones will have a small spot weld holding it in place. I would get the nuts loose/off before breaking the spot weld loose. This can be easy or tricky. On my truck I was able to "break" the PS weld with a wratchet and bar. On the DS no such luck, I had to break it with a hammer and chisel (can't get a grinder down in the floor divet without accidentally cutting the floor up.)