8 3/4 axle ID help - truck?

72-74 W100 also used an 8.75 and had 5 on 5.5 BC
Also 74 was the last year for the 8.75 in E bodies and trucks with some leftovers used in 74 B bodies..
Here is some axle info.

8 3/4" axle shaft lengths measured from the tip of the splined end
to the outside of the flange:

A BODY
'66-'72= 27 11/16"

B BODY
'65-'67= 28 7/8"
'68-'70= 29 3/16"
'71-'74= 30 5/8"
'71-'73 wagon= 31 21/64"

C BODY
'65-'69= 30"
'70-'71= 30 5/8" (Chrysler & Fury)
'70-'73= 31 21/64" (and '69 wagon)


IMPERIAL (Large Bolt Pattern)
'65-'66= 30 1/8"
'67-'69= 30 5/16"
'70-'71= 29"
'72-'73= 31 7/16"

E BODY
'70-'74= 29 31/32"

A100
'65-'70= 30"

D100
'65-'71= 31 1/8"
'72-'74= 31 21/64