The Stovebolt Site Forums The Parking Lot Tons 'o Fun Roll Call for 1-ton-ers

I know of a '72 dually with disks on front. '71 may have been the first year.

On your '65 you can probably just unbolt the crossmember, maybe modify a few holes, and bolt the later one on, all the way up to an '87. I'm not sure when anti-lock brakes became standard on trucks but I believe my '89 1-ton only had anti-lock only on the rear.