Hummer and HMMWV / Humvee comparisons

Here is a list of differences between the HMMWV’s (High-Mobility Multi-Wheeled Vehicle) and Hummers The body styles are very similar, however the soft-top is different for the military then civilian and the military hard doors are different then the civilian full hard doors and the civilian half soft / hard doors. (Military Vehicle Variants Listed at the end)

This list is generalized and is not meant to be a comparison from year to year of the Hummers and / or Humvees. Both have changed in options and architecture since their first conception (1985 for the Humvee and 1992 for the Hummer).

The largest difference between the two is the electrical system

HMMWV’s Have:

• 100% waterproof electrical system (gauges, instrument panel, wiper motor, etc.)
• 24 Volt electrical system (2 batteries in series under pass. seat)
• 100% Waterproof Horn
• Blackout light for lights out driving (next to drivers side turn signal on the hood)
• Taillights and turn signals are equipped with blackout accessories (small lights barely noticeable)
• Ability to turn off every light on the vehicle while driving
• 4 Side Marker lights and 6 Reflectors (no marker lights on front or rear)
• Large style marker lights (semi-circle – similar to side lamps of 92-01 Hummers, they just have 12v bulbs)
• Deep fording kit as an option
• Small box receptacle by passengers foot well (under truck) to activate system by use of pressure
• Completely air lockable fuel, and oil fill tubes
• Extra vent tube on the CDR valve
• Vent running up the air stack when installed
• Solid rubber cap on air cleaner assembly (duckbilled on Hummers)
• Power steering, geared hubs, fuel tank, lift pump all sealed and vented
• Foldable Windshield (after detaching the roof, of course)
• Different windshield frame
• Different windshield wipers / motor / spindles
• Seat compartments (not wasted space as in Hummers)
• Space available under rear seats and a medical kit under the front pass seat next to the batteries
• 3 speed transmission without park (GM THM400 - park pawl would not hold the vehicle at GVW)
• Current have 4 speed trans with park (GM 4L80E)
• Top speed – 55MPH (long durations – the trucks with 4spds can go faster but, convoy speeds and Speedos still register 60mph as top speed / over speed)
• 2.73 Rear-Axle Ratio (3.08 for some newer models) *Add 1.92 to get total drive ratio (from geared hubs)
• GM Diesel 6.2L NA, 6.5LNA, 6.5L Turbo All were / are options for Humvees (no gasoline power engines)
• Torque Sensing differentials (Torsen) 4.0:1 ratio
• Park Break attaching to the drive shaft (GM 6.2L Diesel Humvees only)
• Hydraulic Fan clutch
• Single thermostat
• Single fuel tank
• Small Washer fluid tank
• No cruise control (there is a throttle lock though – not to be used as a cruise – it won’t turn off when the brakes are applied)
• Steering wheel lock (cable from under dash)
• No ABS
• No CTIS (Option on some Humvees – newer trucks have the CTIS equipped hubs but do not have the lines nor the compressor)
• No A/C (unless Ambulance or armored)

· STE/ICE (simplified test equipment, internal combustion engine) diagnostic connector - next to the gear shifters

• 6 100% waterproof guages (fuel, water, oil, electrical, speed, air) 2 warning lights (wait light, e-brake light)
• Originally setup with 8 bolt 2-piece rims for low pressures or bias-ply tires (Trucks now are being converted to the 12 bolt 2-piece)
• 2 point seat belt harness
• Low-back seating (some models have high backs)
• Rear seats fold down and mold into the bed to continue the bed further forward
• No key needed for start or operation
• CARC Paint
• Slave receptacle for the electrical system (under front pass-seat)
• HVAC Unit different
• Non-catalytic system (exempt)
• Standard 36” tires (Bias-ply – old style not in current use for A2’s)
• Light duty half-shafts and ball joints (accept on ambulances and some other models) – therefore the control arms have different sized holes in them
• Ballistic grills available
• Arctic kits available (harder fuel injection system, more interior cushion / padding)
• HD Civilian style rear bumper available as an option (otherwise no bumper)
• Tool storage under rear of truck (where aux fuel tank is on a civ truck)
• Tool storage also under hood where Hummer Batteries are placed – (newer models)
• Different frame rails (7,700 GVWR – increased on newer Humvees)
• GVWR of 10,300 (most common now), and 12,1000
• 12,100 variants have super duty suspensions – totally different then any other HMMWV suspension
• Steering column, pump, and box are different then civilian
• No Actual VIN number, just a serial number and national stock number

Hummers Have:

• CTIS
• Duel fuel tanks
• 14 Marker lights (5 front, 5 rear, 2 left, 2 right)
• Small rectangular marker lights
• No reflectors
• Heated Fuel filter (used to pre-heat the fuel for easier starts)
• Square style turn signals and taillights
• Traction system TT4 (later models)
• ABS (later models)
• TT4 equipped Hummers have Torsen 1.7:1 ratio differentials (others are the same as military)
• A/C
• Stereo
• Cruise Control (later models)
• 8 non-waterproof gauges (fuel, water, oil, speed, CTIS, electrical, Air filter is the same as military, Tach) plus warning lights
• 3 point seat belt harness
• 12 Volt Electrical system (2 batteries in parallel over RH front wheel post ‘93)
• Waterproof electrical system up to 30 inches (interior / marker lights NOT waterproof)
• 2 thermostats (turbo equipped engines only)
• Large capacity washer fluid (later models 99-current)
• Hood Decapitation devices installed
• Non-movable windshield
• 4-Speed with park transmission
• Engine Options for Hummers
• GM Diesel 6.2L (‘92/3), 6.5L NA (94-current), 6.5L Turbo (96-current)
• GM Gasoline 5.7L No longer offered (short build duration mid 90’s)
• Skid plate protection
• Rocker panel protection
• Interior complete and appeasing – creature comforts (carpet / vinyl, glove box, accessory outlets)
• Heated windshield
• Hard doors are actually Solid
• Keyed ignition
• Top Speed - 75 MPH (long durations)
• Undercoated body
• Sealed body
• Rear HVAC Unit
• Gear shifter lights up for both T-case and trans
• Catalytic converter
• Standard 37” tires
• Heavy duty half-shafts and ball joints
• Tilt-wheel
• Have a VIN on dash visible through windshield

Variants of the Humvees (compliments from Liberty Kruger)

Truck, Utility: Cargo/Troop Carrier
M998 (2 or 4 door soft top)
M998A1 (2 or 4 door soft top)
M1037 (S250 shelter carrier)
M1042 (S250 shelter carrier w/ winch)
M1038 (soft top w/ winch)
M1038A1 (soft top w/ winch)
M1097 (heavy variant)
M1097A1 (heavy variant)
M1097A2 (heavy variant)
M1123 (heavy variant)
 
Truck, Utility: TOW Carrier
M996 (hard top)
M996A1 (hard top)
M1121 (hard top, heavy variant)
M1045 (supplemental armor)
M1045A1 (supplemental armor)
M1045A2 (supplemental armor)
M1046 (supplemental armor w/ winch)
M1046A1 (supplemental armor w/ winch)
 
Truck, Utility: Armament Carrier
M1025 (hard top)
M1025A1 (hard top)
M1025A2 (hard top)
M1026 (hard top w/ winch)
M1026A1 (hard top w/ winch)
M1043 (supplemental armor)
M1043A1 (supplemental armor)
M1043A2 (supplemental armor)
M1044 (supplemental armor w/ winch)
M1044A1 (supplemental armor w/ winch)
 
Truck, Ambulance
M996 (armored, 2 litter)
M996A1 (armored, 2 litter)
M997 (armored, 4 litter)
M997A1 (armored, 4 litter)
M997A2 (armored, 4 litter)
M1035 (soft top, 2 litter)
M1035A1 (soft top, 2 litter)

M1035A2 (soft top, 2 litter)

Hummer Variants

2-door
2-door extended cab
4-door soft-top hard doors
4-door soft-top soft-door 
4-door slantback
4-door hardtop
4-door wagon
 
P.S. Slantbacks were used in the military so they wouldn’t burn holes in the wagon roofs with their missile launchers (Pictures at http://www.amgmil.com)