Are you saying that while the splines would be the same, the smaller diameter
5 lug axle would not work because of the difference in bearing size?
The parts catalogs do not specify a difference between 5 or 6 lug
drums, shoes, wheel cylinders, or front and rear wheel bearings.
Info from Classic Parts and Jim Carter.
Jerry
Perhaps I should have been a little more clear. 5 lug in that era would be Passenger car, and 6 lug was Truck. Truck didn't go 5 lug (5 lug, 5" circle, unlike the Passenger 5 lug, 4.75 circle). The Passenger and Truck do not interchange. However, with the later Truck 6 lug ('63-'70, '63-'87 4x4) and the 5 lug ('71-'87 2wd) share many parts (shoes, wheel cylinders), and the axle shafts can be swapped with some minor alterations. The later 5 lug axle shafts can be shortened and regrooved to fit the 6 lug axle width. The '63-mid '65 also need the spider gears swapped to the later 30 spline verions. I do not believe that the later Passenger and Truck axles swap, though.
