NEWS | Feb. 4, 2021

M1097R1 HMMWV: Order Transmissions by Serial Number

If your unit has the M1097R1 HMMWV, NSN 2320-01-346-9317, with a retrofitted engine, check the serial number before ordering a new transmission for the vehicle.
  • M1097R1 HMMWVs with serial numbers between 500000 and 549000 require the 3L80 transmission
  • Those with serial numbers between 570000 and 599000 need the 4L80E/4L85E transmission.