Not a blazer, a Pick-up. But they should be almost the same.
I went to Lowes and picked up 10 3" cutoff discs (Vermont American brand name) and the mandril that adapts them for use in a drill. (I think the size is 3/8") I ground on the side of the bumpstop frame about an 1/8" from the weld and ground it and the weld down until they were the level of the truck frame. When you get near the level of the truck frame smack the bumpstop frame with your hammer and the seam should show up as a crack. Grind off the rear and as much of the fromt as you can get then use a chisle and crowbar to pry the bumpstop frame away from the truck frame. If you have some unground weld at the front you can just wiggle the thing till it breaks off.
The first one took me 2 1/2 hours.... The second one only took an hour.
98SSonNOS did a complete thread with pictures and that is what I followed. Try to find that thread, it was very helpful. If ya have any more questions I'll help any way I can!
Good luck :thumbup: