Use 1/2 inch diameter bolts into the factory's rough pin alignment holes at the bottom of the firewall inboard of the frame rails itself for the "gross" alignment. Install, but do not torque down the mid and rear subframe bolts. You want the subframe to move a bit with effort.
Refer to the subframe alignment dimensions diagram at the end of the 1st chapter of the Factory Service Manual. For those of us with '67's, it's in the Supplemental manual. The corner to corner alignment specs from the midpoint gauge holes are the most critical. With the body suspended and the subframe free (not weight bearing), whack the subframe with a rubber mallet until those cross dimensions are perfect. I did this last part with the engine/tranny and front suspension already attached.
Thanks for the info guys!
I found some info on the net as well. See attached...
Based on the info I got I: - taped a page of blank paper on the floor below the frame in each location where measurements are made (10 pages) - used plumb bob to locate the measurement locations from the frame to the floor - measured between points marked on floor in order to verify measurements against stock dimensions. - compared my measurements against stock dimensions
Next I will adjust the frame by squaring the frame to the body.
Salmon38, which dimensions are you referring to in regards to "The corner to corner alignment specs from the midpoint gauge holes are the most critical. " ??
