Model:

HUMMER H3, H3 Alpha; and H3T, H3T Alpha

Body style / driveline:

4-door, 5-passenger hard-top 4-wheel-drive (H3); Crew Cab (5 passengers), four-wheel-drive pickup (H3T)

EPA vehicle class:

midsize sport utility (H3); midsize pickup (H3T)

Construction:

welded steel frame, electro galvanized steel

Manufacturing location:

Shreveport, La.

Key competitors:

H3: Toyota 4Runner; Jeep Grand Cherokee, Jeep Wrangler Rubicon Unlimited, Toyota FJ Cruiser, Nissan Pathfinder
H3T: Toyota Tacoma, Nissan Frontier, Dodge Dakota

3.7L I-5

5.3L V-8

Displacement (cu in / cc):

223 / 3653

325 / 5328

Bore & stroke (in / mm):

3.76 / 95.5 x 4.0 / 102

3.78 x 3.62 / 96 x 92

Block material:

lost foam cast aluminum

cast aluminum

Cylinder head material:

lost foam cast aluminum

cast aluminum

Valvetrain:

dual overhead camshafts, continuously variable exhaust valve timing, 4 valves-per-cylinder, with dual balance shafts

OHV, 2 valves per cylinder

Ignition system:

distributorless electronic spark, coil-on-plug, platinum-tipped spark plugs

coil near plug, composite intake manifold, platinum-tipped spark plugs, low-resistance spark plug wires

Fuel delivery:

sequential fuel injection

sequential fuel injection

Compression ratio:

10.0:1

9.9:1

Horsepower (hp / kW @ rpm):

239 / 178 @ 5800*

300 / 224 @ 5200*

Torque (lb.-ft. / Nm @ rpm):

241 / 327 @ 4600*

320 / 434 @ 4000*

Recommended fuel:

regular unleaded

regular unleaded

Maximum engine speed (rpm):

6300

6000

Emissions controls:

dual “split converter” design; LEV II

close-coupled catalytic converter, Quick Sync 58X ignition, returnless fuel rail, fast-response O² sensor

EPA-estimated fuel economy (city / hwy):

14 / 18 (H3 w/ auto.)
14 / 18 (H3 w/ man.)
14 / 18 (H3T w/ auto.)
14 / 18 (H3T w/ man.)

13 / 16 (H3 Alpha)
13 / 16 (H3T Alpha)

MA5

Hydra-Matic 4L60

Type:

5-speed manual

4-speed electronically controlled automatic

Gear ratios (:1):

First:

3.75

3.06

Second:

2.20

1.63

Third:

1.37

1.00

Fourth:

1.00

0.70

Reverse:

0.73

2.29

Stall ratio:

3.67

1.90

Final drive axle ratio:

4.56

4.56 (3.7L)
4.10 (5.3L)

Low range lock gear reduction:

2.64 (std.); 4.03 (opt.)

2.64 (std.); 4.03 (opt.)

Crawl ratio (range):

45:1 (std.); 69:1 (opt.)

3.7L: 36.8:1 (std.); 56.2:1 (opt.)
5.3L: 33:1 (std.); 50.6 (opt.)

Front:

independent SLA torsion bar, 46-mm monotube gas-charged shocks, 36-mm tubular stabilizer bar

Rear:

“Hotchkiss” design multi-leaf, semi-elliptic dual-stage leaf spring, 46-mm monotube gas-charged shocks, 25-mm rear solid diameter stabilizer bar

Steering type:

power-assisted rack-and-pinion, with tri-bushing mount design

Steering ratio:

17:1 (H3)
16:1 (H3T)

Steering wheel turns, lock-to-lock:

3.250 (H3)
3.125 (H3T)

Turning circle, curb-to-curb (ft / m):

37 / 11.3 (H3)
43.8 / 13.3 (H3T)

Type:

electrohydraulic power 4-wheel disc, 4-wheel anti-lock, four-piston opposed (fixed) front caliper/single piston sliding rear caliper with Dynamic Rear Proportioning

Rotor diameter x thickness (in / mm):

front: 12.4 x 1.1 / 315 x 28
rear: 12.28 x 0.47 / 312 x 12

Total swept area (sq in / sq cm):

front: 69.4 / 448
rear: 51 / 328

Wheel size & type:

16-inch x 7.5-inch painted steel (H3T only)
16-inch x 7.5-inch aluminum
18-inch x 7.5-inch chrome (H3x)

Tires:

std: P265/75R16 all-terrain steel-belted radials    
opt: LT285/75R16 on-/off-road Bridgestone radials (with ZM6 Off-Road Adventure package)
opt: P265/65R18 Bridgestone radials (with H3x)

Spare tire:

full-size spare

H3

H3T

Wheelbase (in / mm):

111.9 / 2842

134.2 / 3410

Overall length w/ spare and 33-inch tires (in / mm):

187.5 / 4763

212.7 / 5403

Overall width (in / mm):

85 / 2161

85.1 / 2161

Overall height (in / mm):

73.2 / 1860

72.1 / 1831

Track (in / mm):

front: 65 / 1651
rear: 65.5 / 1664

front: 65 / 1651
rear: 65.5 / 1664

Minimum ground clearance front (in / mm):

w/ 33-inch tires: 10.5 / 266
w/ 32-inch tires: 9.7 / 246

w/ 32-inch tires: 9.5 / 242
w/ 33-inch tires: 10.2 / 258

Step-in height (in / mm):

  Front:

w/ 32-inch tires: 23.6 / 600
w/ 33-inch tires: 24.4 / 619

w/ 32-inch tires: 23.4 / 594
w/ 33-inch tires: 24.1 / 613

  Rear:

w/ 32-inch tires: 24.2 / 615
w/ 33-inch tires: 25 / 636

w/ 32-inch tires: 23.9 / 607
w/ 33-inch tires: 24.5 / 623

RTI

21.7

21.7

Approach angle (degrees):

w/ 32-inch tires: 37.4
w/ 33-inch tires: 39

w/ 32-inch tires: 37.1
w/ 33-inch tires: 38.7

Departure angle (degrees):

w/ 32-inch tires: 34.7
w/ 33-inch tires: 36.3

w/ 32-inch tires: 30.9
w/ 33-inch tires: 30.6

Breakover angle (degrees):

w/ 32-inch tires: 22.1
w/ 33-inch tires: 23.7

w/ 32-inch tires: 19
w/ 33-inch tires: 20.2

Grade capability (percent):

60

60

Side slope capability (percent):

40

40

Water fording capability (in / mm):

24 / 610 (at 5 mph)

24 / 610 (at 5 mph)

Curb weight (lb / kg):

4698 / 2131 (3.7L w/ auto.)
4849 / 2199 (5.3L)

4934 / 2238 (3.7L w/ auto.)
5069 / 2299 (5.3L)

H3

H3T

Seating capacity:

5

5

Headroom (in / mm):

  Front:

w/ sunroof: 39.9 / 1014
w/o sunroof: 40.7 / 1034 

w/ sunroof: 39.9 / 1014
w/o sunroof: 40.7 / 1034

  Rear:

w/ sunroof: 39.5 / 1002
w/o sunroof: 39.8 / 1011  

w/ sunroof: 37.3 / 947
w/o sunroof: 39.5 / 1002 

Legroom (in / mm):

  Front:

41.9 / 1063

41.9 / 1063

  Rear:

36.1 / 916

34.2 / 868

Shoulder room (in / mm):

  Front:

54.4 / 1381.3

54.4 / 1381

  Rear:

53.5 / 1358

54 / 1372

Hip room (in / mm):

  Front:

53.8 / 1366

53.8 / 1366

  Rear:

48.1 / 1221

52.6 / 1336

H3

H3T

Cargo capacity (cu ft / L):

25 / 709 (rear seat up)
62.9 / 1780 (rear seat down)

33.5 / 950 (in cargo box)

Cargo area length (in / mm):

24.6 / 625 (rear seat up @ belt)
60.1 / 1525 (rear seat down @ belt)

59.3 / 1506 (in cargo box)

Cargo area height, rear floor to headliner (in / mm):

36.4 / 923 (in rear cargo area)

19.4 / 492 (to top of cargo box)

Cargo area width between wheelhouses (in / mm):

42.1 / 1070 (in rear cargo area)

44.2 / 1123 (in cargo box)

GVWR, standard (lb / kg):

6001 / 2728 (3.7L)
6001 / 2728 (5.3L)

6001 / 2722 (3.7L)                                      6100 / 2767 (5.3L)

Payload, base (lb / kg):

1312 / 595 (3.7L)
1161 / 527 (5.3L)

1090 / 494 (3.7L)                                        1031 / 468 (5.3L)

Fuel tank (gal / L):

23 / 87

27 / 102

Engine oil (qt / L):

6 / 5.7 (3.7L & 5.3L)

6 / 5.7

Maximum trailer weight (lb / kg):

4500 / 2041 (3.7L)
6000 / 2721 (5.3L)

4400 / 1996 (3.7L)                                       5900 / 2676 (5.3L)

Maximum tongue weight (lb / kg):

450 / 204

450 / 204

Michael Cohn is the founder and Editor of ROCKCRAWLER.com. Michael finds great pleasure in driving other peoples' vehicles and doesn't always drive with his mouth open. To volunteer your rig for abuse, please contact Michael at comments@rockcrawler.com.