[randy500]

Cut exactly 12” out of the frame between the cab mounts. I scribe lines 12” apart to cut and 16” apart to verify the final length...those 16” lines will now be 4” apart. Or do some other combination if using a Z cut, which you should. I lay that out on paper and transfer to the frame. Usually 6” offset.

Avoid cutting the vin stamped in the drivers top frame rail and avoid any bends in the lower frame rails, usually only on later model fames.

Move the cab mounts back exactly 12”, scribe lines again, and scribe lines for the cab mount height or make a height jig from wood.

I think the rear cut is 7 7/8”...verify by measuring the distance between the 2 sets of bumper mount holes in the rear frame horns, cut the same amount off as the distance between the bumper mount holes.

Cut and re- flare the rear brake line, make the cut at the front.

Use a dorman cable stop to shorten the emergency brake cable.