Well this will drive me insane. In the manual it says clearance from bottom of cab to top of frame is 1 53/64. The mounts are just a square piece of metal and another piece of rubber but they don't add up to 1" by themselves so what's holding the cab up to 1 53/64" on the front mount?
The measurement is taken from the underside of the floor pan to the top of the frame rail, but the front mountings bolts go through a channel on the bottom of the floor to the frame. Usually needs a piece of 1/8" thick rubber between that and the frame support (give or take).
John
John