kaoss
+1y
Build a jig out of some flat stock or small square tubing. get you some thread all, and some long nuts. Run the thread all through the body mounts on the frame, and weld the long nuts to the flat stock. then you can mark or weld a nut to the top of the thread all were it emerges from the body mount. You now can measure down the thread all however you much you are dropping your body mounts. Since you have decided to go against EVERYONES(mine and James ) advice and not using a Toyota front clip, weld the jig to the front clip. Measuring locations of body mounts is for suckers, build a jig and save the trouble. Does your truck lay out now? If yes, you can do this with the truck laid out, building the jig around the frame, if not, then you can build it on the floor, measure the distance from the frame to the ground, and then add the amount that want to BD the truck and drop the cab mounts that amount. If you decide to go the yota front clip, we measured the distance from the front hub to the front body mount, then located the jig in relation to that figure and ran the rails. I'm sure that I left something out here or there, but it is pretty straight forward, I'll be glad to clear any thing up that I was not clear on.