Thanks. Lowering and tilting forward gets the best results, but the rear gap is still less than 1/16, and it touches in places.
With the door beltline aligned to the beltline in front, the door beltline is low relative to the cab in back.
There is a large gap above the door and some extra gap between the A pillar and window frame.
Would renovating the hinges eliminate sag and improve things?

My suspicion is that the cab may have been tweaked front to back on drivers side. My measurement of the drivers door opening across the beltline is 1/8" smaller than on the passenger side. Hence the temptation to try to spread ever so slightly with a jack

Last edited by wurlitzer46; 06/12/2021 9:53 PM.

52 3100 project
54 3100 / 3112 ice cream truck, next project