Welcome!! I agree that the green AD is a 54. If you could get a peek underneath at the drive shaft you can tell: if it's enclosed (torque-tube) then it's 54, if open then it's 55-1st. The serial number on the drivers door pillar is the true test: H54 is 54 1/2-ton and H55 is 55 1/2-ton. (I know it seems too simple.) Anyway, have fun and good luck.
