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Originally Posted by LockDoc
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As long as this was bumped to the top I will add pictures of the original NOS hardware I have. The first picture is the individual pieces and the second picture shows all of the pieces assembled. I think the picture above from the assembly manual (post #21) shows the two different nuts depending on whether the spare tire hardware uses the lock or not. The part number for the special nut is 3682846. The box is for the lock.
LockDoc
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Great stuff Leon!
Did some digging and confirmed bolt 3991023 is for 1/2 ton applications being a round head square neck bolt 7/16"-20 x 4".
Callout [4] in the drawing
The/a 3/4-1 ton bolt 3898396 is the same but 1/2"-20 x 8 1/8".
Callout [6] in the drawing
So it would go that Callout [5] is a plain 7/16" lug nut and Callout [7] is a plain 1/2-20" lug nut as notated on the assembly drawing.
Really wish the truck assembly manual had part numbers (any part numbers even long superceded) like my Camaro and Vette manuals do!
Nut 3682846 (yours) is the 1/2 ton specific application for the keyed lock.