No, most all 14 bolts and for sure the earlier ones have same spindles for single and dual wheels. This is well documented and I have one of each here and have measured and swapped hubs, they're the same spindles.

What you have run into is a later variation on the 14 bolts that do have shorter spindles, but this is not about being single or dual. I have also had one of these short spindle axles, and it was an 07 model single wheel axle.
Lots of info and some pictures and measurements in this thread.
https://www.stovebolt.com/ubbthread...del_GM_disc_brake_swap_.html#Post1146672

Try this thread for discussion and references proving that the AD 1 ton truck Eaton axles are exactly the same for single wheel and dual except for the stud length.
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1146951/1_ton_rear_axle,_same_for_Sing.html#Post1146951

There is also discussion in a few threads about swapping the Eaton hubs onto a 14 bolt axle by changing some wheel bearings, this excludes the later model short spindle versions.

Grigg


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-