I don't know if this picture of a 450 hub from the GMC Master Parts Book will help any, but here is is. Sorry about using my phone instead of a scanner, but the book still has its original binding and pressing it down flay would probably break it. Ignore the stuff in the upper right of the picture. It is from a different model's hub.

One thing for sure, no snap ring is shown. Looks like there are 2 different outer locking schemes, probably depending on year. 19.0620 & 19.0630
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Last edited by Bill Hanlon; 11/02/2024 9:08 PM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.