couple other things...according to TTI's illustration the vertical plate of the tailpipe hangers should be on the inside of the frame rail...on the drivers side i put it on the outside to mark the location, then drilled straight through the rail...didn't have to unbolt the shackle...i just dont recall if the suspension had to be at full droop or if i had to put the jack under the rear but i think i needed a long drill bit...the bolt comes out above the seam of the tank...so a hefty washer outside the rail, the bracket and a locknut on the inside...its a pia to get the nut up there and started above the tank seam (magnet) but there's adequate clearance between it and the tank when you're done...r/s drill hole inside the rail and was able to use the magnet on a stick to feed the 3/8 bolt from inside the rail through a nearby hole