5 Minutes
Meet the Goliath: Hennessey’s take on the GMC Sierra AT4
The Hennessey Goliath 700 transforms the GMC Sierra AT4 from a refined factory off-roader into a full-blown performance truck. Bold styling, serious hardware upgrades and a brutal power upgrade make this one of the tuner world's most talked-about pickups. It’s loud, it’s unapologetic, and yes—Hennessey says it’s built to both cruise a resort driveway and tackle rough backcountry terrain without blinking.
Powertrain and performance highlights
Under the hood sits a 6.2-liter V8 fitted with Hennessey’s Twin-Screw supercharger and HPE engine management calibration. The result: a headline figure of 700 horsepower and 611 lb-ft of torque—well above the Sierra AT4’s stock figures. Hennessey quotes a 0–60 mph time of 4.2 seconds, a dramatic leap that changes the Sierra’s character from heavy-duty hauler to straight-line weapon.
Key powertrain upgrades include:
- Twin-Screw supercharger on the 6.2L V8
- Air-to-water intercooler system for sustained performance
- HPE Engine Management Calibration for throttle and fuelling optimization
- Stainless-steel cat-back exhaust with upgraded black tips for an assertive soundtrack
These upgrades aim to sharpen throttle response, increase midrange punch and deliver the kind of audible presence expected from a Hennessey build.
Chassis, suspension and off-road capability
Hennessey hasn’t just chased horsepower. The Goliath 700 gets significant suspension and chassis hardware to match its new performance profile. A BDS suspension overhaul, including upgraded upper control arms and integrated Multimatic DSSV dampers, raises ride height while improving damping over rough terrain. The truck rolls on 20-inch Hennessey off-road wheels wrapped in 35-inch tires, giving it the stance and traction required for serious off-road work.
Other functional off-road kit includes a 40-inch LED bumper light bar and three-inch LED pod lights, plus heavy-duty steel bumpers front and rear. The combination of lighting, protection and Multimatic dampers positions the Goliath as a capable overlanding or desert-running platform.
Design and details: more than visual flair
Hennessey’s design changes are as much about temperament as looks. Exposed carbon-fiber hood appliqué, a matching carbon tailgate trim and aggressive steel bumpers give the truck a go-anywhere, take-no-prisoners appearance. The exhaust note, wheel-and-tire combo, and elevated stance complete the transition from stock Sierra to Hennessey supertruck.
Inside, the tuner adds touches that underscore exclusivity: all-weather branded floor mats, headrests embroidered with the Hennessey logo and a serial-numbered interior plaque to remind owners they’re dealing with a limited-modification vehicle. Electronic power running boards improve ingress and egress despite the raised ride height.
How it compares and who it’s for
If you follow the performance truck scene, the Goliath 700 competes with boutique and factory-turned-high-performance pickups that prioritize a mix of luxury, speed and capability. Unlike straight drag-focused builds, Hennessey’s approach keeps off-road competence high on the checklist. That makes the Goliath attractive to buyers who want weekend resort curb appeal and legitimate trail or desert drive potential.
Quote from Hennessey’s messaging: "We build trucks for customers who want more than factory capability—refined on-road comfort with no compromises off-road." Whether you’re chasing fun on wide-open highways or planning a weekend getaway to rough trails, the Goliath is pitched as a do-it-all weapon.
Warranty and ownership
Hennessey backs the Goliath upgrades with a limited warranty: three years or 36,000 miles, whichever comes first. That warranty window signals confidence in the package and offers buyers a measure of reassurance when investing in significant aftermarket performance work.
Highlights at a glance:
- 700 hp / 611 lb-ft from a supercharged 6.2L V8
- 0–60 mph in approximately 4.2 seconds
- BDS suspension with Multimatic DSSV dampers
- 20-inch Hennessey wheels with 35-inch off-road tires
- Carbon fiber accents, steel bumpers, upgraded lighting
- 3-year / 36,000-mile warranty
Final thoughts
The Hennessey Goliath 700 takes a premium off-road truck and amplifies its personality—adding supercar-level acceleration without abandoning the Sierra AT4’s work and off-road DNA. It’s a niche vehicle for buyers who want exclusivity, theatrics and genuine capability in one package. For the tuner crowd and experienced truck buyers, the Goliath is a clear statement: if you want a Sierra that stands apart at the resort and tears up unpaved roads afterward, this Hennessey build delivers.
Whether you love the over-the-top styling or find it excessive, the engineering behind the Goliath 700 underscores a simple truth in today’s performance market: there’s still room to reinterpret factory trucks into highly capable, highly individual machines.
Source: autoevolution
Comments
v8rider
Wow 700hp in a Sierra? insane. Love the offroad bits, but that exhaust will wake the whole valley lol. If that's real then...
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