M939A2 Front Hub/Spindle Compatibility

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19K M1 Armor Crewman
Steel Soldiers Supporter
Culver City, CA
I want to convert my front axle to outboard brake drums. My M818 is currently equipped with M939/M939A1 wedge brakes. The simplest route is to convert to the M939A2 hub/drum combination. I am not looking for a functioning CTIS system. I know that the brake spiders, air chambers and shoes are the same across all M9393-series trucks.

So with that, my questions is, are the M939A2 hubs and bearings compatible with the front steer spindles found on the M939A1/M939/M809/M39-series trucks? TM 9-2320-272-24P-1, pages 0237-2 & 0237-3, indicate (per the Usable On Codes [UOC]) that the standard NON-CTIS spindle, p/n 7346982, is compatible across all the incarnations of the M939-series of trucks. I find myself second guessing the TM, so any verification out there would be greatly appreciated.


My safe word is Pork and Beans.
Supporting Vendor
Memphis, TN
No. Different inner bearings. Outer bearings are the same though.

It would depend on where the a2 hub sits on the spindle. You would have to check the taper and find a correct rear seal.
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