4×4S.ORGTHE REGISTRY OSHKOSH · M-ATV AND JLTV · CHASSIS NUMBERS

Marque · M-ATV and JLTV · chassis numbers

Oshkosh M-ATV and JLTV chassis numbers

Oshkosh trucks carry the seventeen-digit VIN under the Oshkosh Truck WMI 10T and, in service, the US Army registration number stamped on the bumper and a data plate with the M-designation (M1240, M1278, MK23, M1078) and contract number; NATO export vehicles carry their own military registrations. [1][2][3]

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2NUMBERING SCHEMES0SEQUENCES LISTED11VEHICLES IN THE REGISTRY3SOURCES

Where to find it

The data plate in the cab (dash or door frame) with VIN, model, contract and date; the Army registration on the bumper and tailgate; a chassis stamping on the right frame rail.

How to read it

1981–Seventeen-digit VIN
  • 1–3 WMI (10T Oshkosh Truck, Oshkosh, Wisconsin)
  • 4–8 vehicle attributes (model, GVWR, engine)
  • 9 check digit
  • 10 model year
  • 11 plant
  • 12–17 sequence
In serviceM-number + Army registration
The data plate gives the military model (M1240, M1240A1, M1245, M1277, M1278, M1279, M1280, M1281, M1078, M1083, MK23, MK36) and the US Army registration (NA…, NC… prefixes) or Marine Corps number identifies the vehicle in the fleet.

Prefixes

Prefix or codeMeans
10TOshkosh Truck Corporation WMI
M1240 / M1240A1 / M1277 / M1245M-ATV base, underbody kit, CROWS, SOCOM
M1278 / M1279 / M1280 / M1281JLTV heavy guns carrier, utility, general purpose, close-combat weapons carrier
MK23 / MK25 / MK27 / MK28 / MK29 / MK30 / MK31 / MK36MTVR cargo, winch, extended, dump, tractor, wrecker
M1078 / M1079 / M1081LMTV cargo, van, airdrop
M1083 / M1084 / M1085 / M1088 / M1089MTV cargo, crane, long, tractor, wrecker

Sources

  1. 1Oshkosh M-ATVWikipedia · accessed 2026-09-22
  2. 2Oshkosh L-ATVWikipedia · accessed 2026-09-22
  3. 3Vehicle identification numberWikipedia · accessed 2026-09-22

The numbers are as the sources cited above record them — the parts trade's frame-number charts, the clubs' transcriptions of the makers' bulletins and the enthusiast decoders; a blank cell means no number is recorded. Registry research, not a factory record — check the vehicle's plate and the maker's build record before relying on a range. Corrections through the suggestion form.