Success. I figured the driver side front mount had crumbled meaning the cab as simply leaning into the front left corner. I raised the cab by the roof and hey presto, flat floor.

Cut out some of the driver side floor and mocked up the mount support rail that runs under the floor. Looking MUCH better. Nothing being welded until everything lines up. Have to admit that initial gap had me worried.

First photo is level on top of old floor, second photo is with removed floor and level resting on mount rail.
Attachments
1.jpg (304.66 KB, 112 downloads)
2.jpg (289.46 KB, 110 downloads)

Last edited by paul65; 11/26/2022 4:39 PM.

1951 3100 5-window
with a '55 235/floor mounted 3-speed
Some of the story in ODSS
Most of it in The Shops Area wink