Here is some good info. including a little about the drivetrain
Combining a five-speed-manual first gear and an optional transfer-case low-range ratio of 4.03:1 (industry leading), the H3 has a crawl ratio of almost 69:1, where most other serious 4x4s are doing well with a 35:1 ratio. The 4.03:1 low-range transfer case is also offered with the four-speed automatic (the 4L60-E), also offering an impressive 56:1 crawl ratio. Further, Hummer engineers had to make suspension changes to allow the H3 wheels to droop and flex over ruts, holes, and rocks with poise and confidence. And although there's no anti-roll bar disconnect, trail flex was impressive for the smallish brute. The H3 will offer 32-inch Bridgestones that performed amazingly well, conforming like marshmallows over the jagged surfaces, once we took out almost 20 pounds of tire pressure.
ENGINE
Type: inline-5, aluminum block and head
Bore x stroke: 3.66 x 4.00 in, 93.0 x 101.6mm
Displacement: 211 cu in, 3451cc
Compression ratio: 10.0:1
Fuel-delivery system: port injection
Valve gear: chain-driven double overhead cams,
4 valves per cylinder, hydraulic lifters,
variable exhaust-valve timing
Power (SAE net): 220 bhp @ 5600 rpm
Torque (SAE net): 225 lb-ft @ 2800 rpm
Redline: 6400 rpm
DRIVETRAIN
Transmission: 4-speed automatic
Final-drive ratio: 4.56:1
4-wheel-drive system: full-time 2-speed with a manual
locking center differential, an open front
differential, and an electronically locking
rear differential; brake-based traction control
Transfer-gear ratios (low/high): 4.03:1/1.00:1
Gear, Ratio, Mph/1000 rpm (L/H), Max test speed (L/H)
I, 3.06, 1.7/6.8, 11/43 mph (6400/6400 rpm)
II, 1.63, 3.2/12.7, 20/81 mph (6400/6400 rpm)
III, 1.00, 5.1/20.8, 33/97 mph (6400/4650 rpm)
IV, 0.70, 7.4/29.6, 47/97 mph (6400/3250 rpm)
DIMENSIONS
Wheelbase: 111.9 in
Track, front/rear: 65.0/65.5 in
Length/width/height: 186.7/74.7/74.5 in
Ground clearance: 9.1 in
Drag area, Cd (0.51) x frontal area (32.9 sq ft): 16.8 sq ft
Curb weight: 4980 lb
Weight distribution, F/R: 50.2/49.8%
Curb weight per horsepower: 22.6 lb
Fuel capacity: 23.0 gal
CHASSIS/BODY
Type: full-length frame
Body material: welded steel stampings
INTERIOR
SAE volume, front seat: 54 cu ft
rear seat: 43 cu ft
cargo, seats up/down: 29/56 cu ft
Front-seat adjustments: fore-and-aft, seatback angle, front height, rear height, lumbar support
Restraint systems, front: manual 3-point belts, driver and passenger front and side airbags
rear: manual 3-point belts
SUSPENSION
Front: ind, unequal-length control arms, torsion bar, anti-roll bar
Rear: rigid axle, leaf springs, anti-roll bar
STEERING
Type: rack-and-pinion with hydraulic power assist
Steering ratio: 17.0:1
Turns lock-to-lock: 3.3
Turning circle curb-to-curb: 37.1 ft
BRAKES
Type: hydraulic with hydraulic power assist and anti-lock control
Front: 12.4 x 1.1-in vented disc
Rear: 12.3 x 0.5-in disc
WHEELS AND TIRES
Wheel size/type: 7.5 x 16 in/cast aluminum
Tires: Bridgestone Dueler A/T RH-S,
LT285/75R-16 116/113Q M+S
Test inflation pressures, F/R: 35/35 psi
Spare: full size on aluminum wheel
C/D TEST RESULTS
ACCELERATION: Seconds
Zero to 30 mph: 3.3
40 mph: 5.0
50 mph: 7.4
60 mph: 10.2
70 mph: 13.5
80 mph: 18.2
90 mph: 26.1
Street start, 5-60 mph: 10.5
Top-gear acceleration, 30-50 mph: 5.2
50-70 mph: 7.2
Standing 1/4-mile: 17.8 sec @ 79 mph
Top speed (governor limited): 97 mph
BRAKING
70-0 mph @ impending lockup: 199 ft
HANDLING
Roadholding, 300-ft-dia skidpad: 0.66 g
Understeer: minimal moderate excessive
FUEL ECONOMY
EPA city driving: 16 mpg
EPA highway driving: 19 mpg
C/D-observed: 15 mpg
INTERIOR SOUND LEVEL
Idle: 45 dBA
Full-throttle acceleration: 77 dBA
70-mph cruising: 69 dBA
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