The H3T’s frame and
suspension system are based on a stretched version of the H3 SUV’s
chassis and suspension – the same race-proven design found on
Baja 1000-winning stock-class race trucks. The wheelbase measures
134.2 inches (3,409 mm) – 22 inches (86 mm) longer than the
H3 SUV. A ladder-type frame is the truck’s foundation and it
has a modular, three-piece design that incorporates fully boxed components
for outstanding strength and stiffness. An independent SLA torsion
bar front suspension and multileaf Hotchkiss-type rear suspension
are used. There are two suspension packages available:
- Z85 Heavy-Duty Handling and Trailering – This standard
suspension delivers an excellent balance of on-highway comfort
and off-road capability. It includes 32-inch all-terrain tires
mounted on 16-inch, smoke-color steel wheels, specially tuned
heavy-duty shocks and either a 4.56-ratio (3.7L) or 4.10-ratio
(5.3L) rear axle.
- Off-Road Adventure – Designed for more aggressive off-road
performance, this optional suspension package includes taller,
33-inch tires, specifically tuned shocks, locking front and rear
differentials, 4.03:1 low-range gearing in the transfer case and
industry-leading crawl ratios of either 68.9 with the manual transmission
or 56.2 with the automatic.
To support the torque output of the 5.3L V-8, the H3T Alpha’s
front differential case is made of cast iron; other models feature
an aluminum case. V-8-powered vehicles also receive higher torsion
bar rates to support the increased mass and specific shock valving.
The chassis and suspensions were validated in real-world testing on
off-road trails in Moab, Utah; the Rubicon Trail in California, and
other challenging off-road venues.
Off-road capability
The H3T lives up to HUMMER’s
legendary off-road reputation, with best-in-class extreme off-road
capability. Highlights include:
- Ability to climb a 60-percent grade and traverse a 40-percent
side slopeExceptional 10.2-inch (285 mm) ground clearance (with
33-inch tires)38.7-degree approach angle and 30.1-degree departure
angle (with 33-inch tires)Segment-first available front- and rear-locking
differentials
- Standard HUMMER Hill Hold Assist for improved hill ascension
“For most
lifestyles, there’s almost nothing the H3T can’t handle,”
said Walsh. “It’s a truck with HUMMER’s immutable
capability.”Complementing the features that enable the H3T’s
impressive off-road prowess is a host of first-class protective elements,
including four standard skid shields: a front shield, an oil-pan shield/front-axle
shield, a transfer case shield and a fuel tank shield.
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