The 1/2 ton TF rear spring pad spacing is very close to the 3/4 ton AD and will bolt in with no mods.
I considered this swap on my '52 3600. However the pad inclination on the TF rear may not give you the exact pinion angle you want for the AD. Make sure you check it. You could shim it if you don't want to mess with relocating the pads.


Steve

'49 3800
'52 3600
'57 3100