TM 9-2330-339-23P (Dec 15) lists the wrong NSN for the rear axle assembly. The correct NSN for the rear axle assembly shown as Item 1 in Fig 7 is NSN 2530-01-680-4885.
UPDATED Sep 3, 2021: If you have trailers that you've already modified with the wrong NSN rear axle assembly, you will need to remove these axle assemblies. Currently, there's no removal timetable, but the axle assemblies must be removed and replaced with the correct rear axle assembly.
Rear axle assembly shown as Item 1 in Fig 7 of TM 9-2330-339-23P
The affected models are listed in the following table:
Currently, the TM lists NSN 2530-01-537-7118 for the rear axle assembly, which only fits M967A2 and M969A3 fuel tankers. It cannot be used as an upgrade for the older models because it has not been tested and is not approved to be used on them.
So don’t use NSN 2530-01-537-7118 on older model fuel tankers! It’s not an upgrade!
Jot this down until the TM is updated.