Here's an email that came to me from "oletrucks":
From R.D. Hulst:
[email protected]... for my '51 3/4 ton...used a disc brake setup from a 1984 F250 Rear Wheel Drive:
Inner Bearings
Timken Cone L689149
Timken Cup L68110
This gives a bearing ID of 1.3775", meaning you have to have the inner end of the spindles machined down to this diameter and OD of 2.3280 and a bearing width of 0.625". You'll need to make a spacer with width of 0.6250", OD no larger than 2.3280" and an ID of 1.3775 to keep the rotor from grinding against the spindle mount points.
Outer bearings:
Timken Cone: LM12748
Timken Cup: LM12710
This gives the following bearing dimensions: ID 0.8437" OD 1.7810" W 0.6100
I had to make an outer spacer to ensure the nut didn't run out of threads.
Seal: NAPA NOS19743
Rotor left: NAPA UBP 85682
Rotor right: NAPA UBP 85682
Caliper Left: NAPA RBP 4424032MS (single piston)
Caliper Right: NAPA RBP 4424033ms (single piston)
I had to make caliper brakets that look alot like the ones you see with the 1/2 ton conversion kits. This was trial and error. Replaced the original wheels with a set from an '84 F250.
