H3 FAQ - Factory Specs

[Wisha Haddan H3]

Hummer H3 Factory Specs

Body style - Four-door, five passenger
EPA size class - Midsize SUV

Available Engines

2006

Engine - 3.5 L I5 (L52)
Engine Material - aluminum
HP - 220 @ 5600 rpm
Torque (lb-ft) - 225 @ 4600 rpm
Fuel Induction - Sequential MPFI
Bore x stroke - 3.66x4.00 in
Displacement - 211 ci (3.5 L)
Compression ratio - 10.0:1
Valve gear - DOHC, 4 valves/cylinder
Fuel - 87 octane
Est MPG (auto) - 16/19
Est MPG (man) - 16/20

2007-08

Engine - 3.7 L I5 (LLR)
Engine Material - aluminum
HP - 242 @ 5600 rpm
Torque (lb-ft) - 242 @ 4600 rpm
Fuel Induction - Sequential MPFI
Bore x stroke - 3.76x4.00 in
Displacement - 223 ci (3.7 L)
Compression ratio - 10.0:1
Valve gear - DOHC, 4 valves/cylinder
Fuel - 87 octane
Est MPG (auto) - 15/19
Est MPG (man) - 15/20

2008 Alpha

Engine - 5.3L V8 MFI
Engine Material - aluminum block
HP - 292 @ 5200 rpm
Torque (lb-ft) - 317 @ 4000 rpm
Fuel Induction - MFI
Bore x stroke - ???
Displacement - ???
Compression ratio - ???
Valve gear - ???
Fuel - ???
Est MPG (auto) - ???
Est MPG (man) - ???

Powertrain

Manual transmission - Aisin AR5 (MA5)

1st - 3.75:1
2nd - 2.26:1
3rd - 1.37:1
4th - 1.00:1
5th - 0.73:1
Reverse - 3.67:1

Automatic transmission - 4L60E

1st - 3.06:1
2nd - 1.63:1
3rd - 1.00:1
4th - 0.70:1
Reverse - 2.29:1

Transfer case

OEM (Base/Adv) - Borg-Warner 4493/4494
Ratio (Base) - 2.64:1
Ratio (Adventure) - 4.03:1

Axle ratio (non-Alpha) - 4.56:1
Axle ratio (2008 Alpha) - 4.10:1

Crawl Ratio

Base (auto) - 36.8
Base (man) - 45.1
Adventure (auto) - 56.2
Adventure (man) - 68.9
Alpha (auto) - 50.5

Dimensions

Length - 186.7 in
Width - 85.5 in
Height - 74.5 in
Wheelbase - 112.0 in
Track, front/rear - 65.0/65.5 in
Turning circle - 37.0 ft
Ground clearance (max) - 9.1 in
Approach angle - 39.4 deg
Departure angle - 36.5 deg
Breakover angle - 25.0 deg

Capacities

Base curb weight - 4700 lbs
Rear payload, 2006/07/08 Alpha - 950/1150/1530 lbs
Roof payload (factory bars) - 250 lbs
Cargo volume (behind 1st row) - 55.7 cubic ft
Cargo volume (behind 2nd row) - 29.5 cubic ft
Cargo area (behind 1st row) - 41" wide x ???" deep
Cargo area (behind 2nd row) - 41" wide x 28" deep
Fuel capacity - 22.8 gal

Towing

Towing capacity (auto) - 4500 lbs
Towing capacity (man) - 3000 lbs
Towing capacity (2008 Alpha) - 6000 lbs
Trailer Tongue Weight - 500 lbs
GVWR - 5850 lbs
GCWR - 10,000 lbs
GAWR (front) - 3050 lbs
GAWR (rear) - 3200 lbs

Chassis

Suspension (front) - IFS, double A-arm, torsion bar, swaybar
Suspension (rear) - live axle, leaf springs, anti-roll bar
Steering type - Power rack-and-pinion
Steering ratio - 17.0:1
Steering turns (lock to lock) - 3.25 turns
Brakes (front) - 12.4 in vented discs
Brakes (rear) - 12.3 in discs, 4 wheel anti-lock
Tie rod specs - ???
Shock length (front/rear, base/adv) - ???

Wheels/Tires

Size - 16x7.5 in
Bolt pattern - 6@5.5” (139.7mm)
Backspacing - 6 in
Offset - 30 mm (1.18 in) negative
Centerbore - 100.6
Tire size (Base) - 31.6 in, P265/75R16 Goodyear Wrangler RTS
Tire size (Adventure) - 32.9 in, LT285/75R16 Bridgestone Dueler A/T

[Wisha Haddan H3]

Can someone with a Base H3 check the GAWR numbers inside the driver door? I think they're the same as the Adventure, but I want to make sure.

Also, anyone have specs on the shocks and tie rods? I need something more exact than ???

And of course, feel free to suggest anything I missed.

[fourfourto]

I thought the MPG on the 07's droped to 15 city?

[Wisha Haddan H3]

Originally Posted by fourfourto

I thought the MPG on the 07's droped to 15 city?

Oops ... thanks 442. Fixed

[3Hummer]

2007 Base H3:

GAWR FRT: 3050 LBs
GAWR RR: 3200 LBs

[evldave]

Payload on my '06 says 950lbs, not 1150. Could it have gone up for '07??

[Wisha Haddan H3]

Originally Posted by evldave

Payload on my '06 says 950lbs, not 1150. Could it have gone up for '07??

I guess so. I don't have the 06 specs, but the 07 specs definitely say 1150 lbs. Thanks for looking this stuff up guys

[Agriv8r]

great info, thanx...

Originally Posted by fourfourto

I thought the MPG on the 07's droped to 15 city?

Yep. And new revised ratings will be lower for all, and meant to better reflect real mileage.

This is a great reference chart, for folks wanting to know the difference. Maybe it should be made into a Sticky.

[f5fstop]

2008 Alpha
Engine - 5.3L V8 MFI
Engine Material - aluminum block
HP - 292 @ 5200 rpm
Torque (lb-ft) - 317 @ 4000 rpm
Fuel Induction - MFI
Bore x stroke ? 3.78x3.62 in
Displacement ? 325 ci (5.3L)
Compression ratio ? 9.95:1
Valve gear - OHV
Fuel ? 87 octane
Est MPG (auto) - TBD
Est MPG (man) ? NO MANUAL TRANS

[Wisha Haddan H3]

Originally Posted by f5fstop

2008 Alpha
Engine - 5.3L V8 MFI
Engine Material - aluminum block
HP - 292 @ 5200 rpm
Torque (lb-ft) - 317 @ 4000 rpm
Fuel Induction - MFI
Bore x stroke ? 3.78x3.62 in
Displacement ? 325 ci (5.3L)
Compression ratio ? 9.95:1
Valve gear - OHV
Fuel ? 87 octane
Est MPG (auto) - TBD
Est MPG (man) ? NO MANUAL TRANS

Thanks f5! My edit rights ran out on the post, but I'll ask humbebe to add your info

[ChevyHighPerformance]

Ground clearance: 8.5 inches (32 inch tires), 9.1 inches (33 inch tires)

Approach angle: 37.5 degrees (32 inch tires), 39.4 degrees (33 inch tires)

Departure angle: 35.5 degrees (32 inch tires), 36.5 degrees(33 inch tires)

Breakover angle: 23.5 degrees (32 inch tires), 25.0 degrees(33 inch tires)

[LesC.]

Originally Posted by f5fstop

2008 Alpha
Engine - 5.3L V8 MFI
Engine Material - aluminum block
HP - 292 @ 5200 rpm
Torque (lb-ft) - 317 @ 4000 rpm
Fuel Induction - MFI
Bore x stroke – 3.78x3.62 in
Displacement – 325 ci (5.3L)
Compression ratio – 9.95:1
Valve gear - OHV
Fuel – 87 octane
Est MPG (auto) - TBD
Est MPG (man) – NO MANUAL TRANS

08 alpha (auto) observed mpg = 17mpg
haven't checked around town mpg .... I may not want to.

[D-MAX]

Engine Material - aluminum block??? i'm no expert but i think it's aluminum heads.

[Texas Red]

Yep, it has an aluminum block. But I think it has steel inserts for the cylinders to ride in.

[3Hummer]

anyone got a verified 0-60 time and quarter miletime and at what speed and..... top speed. Im just really curious about that.

[Sewie]

Originally Posted by 3Hummer

anyone got a verified 0-60 time and quarter miletime and at what speed and..... top speed. Im just really curious about that.

Why, you planning on racing it?

[3Hummer]

hahah no, its just something i would like to know about my vehicle.

[Texas Red]

Get a stopwatch and tell us what it'll do.