From my research over the years, the 14 bold had a few different widths.
63.5" cab and chassis with dual rear wheels
67.5" single rear wheel
70" for single rear wheel vans
and 72" for duallies
and well, make a 76" WMS axle using dually axle with SRW hubs.
The 67.5" SRW and 63.5" DRW used the same axle, but used different hubs to achieve the narrower WMS.
The duallies used a very wide axle with the same hubs as the 63.5" axle.
You can make an 76" WMS axle using SRW hubs on the dually axle.
The 2001+ 14 bolts came factory with disk brakes and are 68" wms. They have m14x1.5 studs vs the old 9/16-18 studs. I am running a 14b Rear in my J20 that I had a water jet cut the same backing plate as a 2001+ axle and welded it up. Machined the hubs down to fit a 2001+ rear 3500 rotor over the hub, and have the parking brake. Was a lot of work and wish I had used a 2001+ newer axle from the start. All of the 14B full floater axles used the same gears and carrier regardless of year. Only difference is the bearing kit.
I did the disk brake conversion using the 3/4 ton rotors and calipers and hated it. I did find the eldorado calipers with he parking brake and even with them fully adjusted, wouldnt hold worth a crap, especially with my beast weighting 7600lbs on 40's. Thats why I converted it to use the factory 2001+ calipers, rotors, parking brake components.
1974 Jeep J20, gladiator grill, 6BTA JWAC cummins, HX55, 4in exhaust to 5in stack, nv4500/ford np205, 14b kingpin axle, 14b rear axle, 4.56 gears, 40x13.50r17's on 17x10 mags
G56 6 speed with dual disk clutch
Vintage air AC and Heat underdash combo unit
Last edited by BA_051 : 03-05-2021 at 10:12 PM.