Yes the whole cab is fairly malleable on these old trucks
A rough road seems to change all the dimensions a tiny bit with every drive.

Example: even tho you think these old trucks are tough as nails
Do not Jack them up by the bumpers
This will twist and move the bumper every time
The factory jack is meant to go under the axle only

Do your door and body massaging gently
Don’t try to make it move the whole way in one shot
Baby steps
-s