Hummers & HMMWV's Compared

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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).

Here are a few differences regarding crash test comparisons of H1s and '80's era HMMWVs:

ALL H1's have;

A hood restraint system (helps prevents the hood from intruding into your space and completely ruining your day)

A collapsible steering column (helps your ribs continue to protect your heart, lungs, and other important stuff)

A windshield glass retention system (helps keep your head on your shoulders)

A 3 Pt. restraint (seat belt) system (helps keep your head, etc. from spoiling the appearance of your vehicle's interior surfaces)

A T-Case restraint system (helps keep you from getting too HOT by reducing the likelihood of the T-Case and rear prop splitting open the fuel tank)

This is why AM General (the contracted manufacturer) and our Government (the specifier and original owner of ex-mil. HMMWVs) is none to happy to see 80's vintage HMMWVs in private hands and in use On-highway and Off-road?

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

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

P.S. Slantbacks were used in the military so they wouldn't burn holes in the wagon roofs with their missile launchers.