Pull the blazer in to thaw out and get ready to install the fuel tank. I have a blazer tank from a later model blazer. I have always thought it was a 31 gal but I am 100% sure. Anyways If I give the filler neck 1/2" clearance I will only have 3" clearance from bottom of tank to the top of my rear end. I flexed it around some (see other thread) to see if it moved and it doesn't by flexing the rear end up but I know when I jump it it will probably hit. I could do bumpstops but just not sure if that would limit too much. Does anyone have the dims of the stock 21 gal, 25 and 31 gal tank from later years?