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A2 Series Components

*Not applicable to expanded capacity models
M998A2 Series Common Components
Engine: * Type: V-8, 6.5L Diesel Fuel Injection, Naturally Aspirated (N.A.), EPA Compliant
Horsepower (@ 3,400 RPM): 160 HP (120 KW)
Torque (@ 1,700 RPM): 290 lb.-ft. (393 N m)
Governor Type: Mechanical
Displacement: 400 cu. in. (6.5L)
Bore & Stroke: 4.06 x 3.83 in. (10.3 x 9.7 cm.)
Compression Ratio: 21.3:1
Fuel Capacity: 25 gal. (94L) (useable)
Transmission: Type: 4-speed automatic with a maximum input torque rating of 451 lb.-ft. (612 N m)
Gear Ratios:
  • 1st- 2.48:1
  • 2nd- 1.48:1
  • 3rd- 1.0:1
  • 4th- .075:1
  • Reverse- 2.08:1
  • Torque Converter ratio- 2.1:1
Transfer Case: Gear Ratio: Low- 2.72:1; High - 1.01:1
Axles: Hypoid with a ratio of 2.73:1. Continuous torque rating: 1,281 lb.-ft. (1,737 N m)
Geared Hubs: Gear ratio: 1.92:1
Frame: Steel box section with 5 crossmembers
Electrical: 12/24-volt waterproof 200-amp.
Alternator: 400-amp. alternator is available as a kit
Steering: Power-assisted with a variable ratio of 13/16:1
Differential: Torque-biasing differential
Brakes: Hydraulically actuated, four-wheel inboard mounted power disc brakes with dual reservoir master cylinder. Rotors are 12.0 in. (0.30 m.) in diameter with an effective area of 21.4 in2 (0.014 m.2) each. The parking brake manually activates the rear service brakes.
Suspension: Independent double A-frame with open-end coil springs and hydraulic shock absorbers.
Tires: 37 x 12.5 R16.5 LT load range "D" Radial with low profile runflat device
Wheels: 3,850 lbs. (1,747 kg.) capacity 16.5 x 8.25 2-piece take-apart wheels
The performance indicated does not reflect the capability of the HMMWV, but rather reflects the performance required by the U.S. military
Series Applicable Performance (at GVW)
Maximum Speed: 70 mph (113 kmph)
Grade Capability: 60%
Run Flat Capability: 30 miles at 30 mph (48 km at 48 kmph)
Side Slope Capability: 40% (M1097A2 w/shelter 30%)
Ramp Breakover Angle: 31.5°
Turning Radius (curb to curb): 25 ft. (7.62 m.)
Deep Water Fording: w/o kit- 30 in. (0.76 m.); with kit- 60 in. (1.52 m.)


**Not to include M997 Ambulance and Armored HMMWVs.

Armament Provisions:

ASP® is a registered trademark of the McDonnell Douglas Helicopter Co.

Optional Equipment:

A wide range of optional equipment is available to enhance the HMMWV's capability and/or enable it to perform specific missions. This includes: