Mack Granite

The Granite is a Class 8 heavy-duty vocational truck from Mack Trucks, a weight class explained in GVWR, GCWR and GAWR. Mack’s Granite page, headed “All new. All Mack.”, announces “the all-new Mack Granite” with the 2027 Mack MP13 engine, and a second page lists the earlier truck as the Legacy Mack Granite. This page is built from those two undated product pages, read on 8 November 2026, and from two articles in Mack’s magazine whose addresses date them to March 2026: “Comfort, Durability & Quality are Hallmarks of the New Granite” and “Boosted Power and Performance”.

Overview and generations

The new Granite’s product page lists two day cabs, axle-forward and axle-back, five axle configurations, the Mack MP13 and Cummins X10 engines, and the mDRIVE HD automated manual and Allison RDS automatic gearboxes. Among the downloads it names are documents on the Granite as a concrete mixer and as a dump truck in construction, and on the Granite in mining; the two body types are described in truck mixers and concrete pumps and tipper trucks. Mack’s medium-duty line is the Mack MD.

According to the March 2026 article on its design, chief designers Lukas Yates (exterior) and Vincent Lokers (interior) started from a clean sheet, an all-new “body in white”. Yates says the designers took the Mack R model as inspiration, with a hood feature on the side of the air intake that “kicks up at a 45-degree angle”, and that they were not interested in making a retro truck. About 25 drivers evaluated early clay, foam and 3D-printed prototypes at a clinic, with the branding removed so that they did not know they were looking at a new Mack.

Mack keeps the earlier truck on a page of its own as the Legacy Mack Granite, described in the last section below; the new truck’s page links to it with “Meet the original champion of the jobsite.” No document opened gives a launch date or a start of production for the new Granite, a production plant, or the years in which the Legacy Granite was built.

Cab and interior

The new Granite has an all-new galvanised steel cab. Mack lists two day cabs, axle-forward and axle-back, each with a 113.5-inch BBC (bumper to back of cab) and each with the footnote “Available in 44-inch mid roof sleeper option.” The product page gives 9 inches of added width at the driver’s shoulders. The design article says the door opening has grown by 3.5 inches fore and aft and by 1 inch in height, and Lokers says the A-pillar is very similar to the older truck’s and is then wedged out to improve aerodynamics and to give more room to drivers and passengers. The steps were redesigned to be “less like a ladder and more like a staircase”, the grab handles were moved inside the cab, and self-cleaning steps are standard.

The design article describes the windshield as one-piece bonded glass, replacing the previous model’s split windshield, and Yates says the new design deflects rocks. The product page lists an ImpactShield windshield with “2x the impact resistance and 5x scratch resistance”, without stating the reference, and its standard exterior list also includes a “Rubber-sealed windshield”. The LED headlamps are heated to de-ice them, cornering lights have been added, and the grille is stainless steel, shaped to bring air both to the front of the truck and into side air intakes to the engine plenum. A digital mirror system, with cameras in place of mirrors, is optional. The other standard exterior items are a tight turning radius, a sloped hood, the Cornerstone chassis, high ground clearance, a D-shaped fuel tank, heavy-duty crossmembers, top-mounted rear axle carriers, an air-assisted clutch, cab air springs and a body-ready electrical system.

Inside, the product page lists a flat-bottom steering wheel with multifunction controls, an ergonomic dashboard with a 12-inch Mack CoPilot display, advanced automatic climate control and a standard wide-base, high-back seat. According to the design article, the top of the instrument panel was pushed forward and its bottom pulled rearward. A structural extrusion on the panel serves as an accessory rail for phones or monitors and as a handhold for pulling up from the seat, and a cord-management section keeps cords from hanging down on the panel. Drivers can rearrange the HMI switches, which carry laser-etched symbols or text, and the secondary information display, used for driver information and maps, is “now nine inches wide”. Metal is used at touchpoints such as the door release handle, and a branded metal ELD plate takes devices through modular accessories. A section behind the door panel channels heating and air conditioning onto the driver’s shoulder and helps defrost the side glass.

The steering wheel keeps Mack’s flat-bottom design and carries an airbag, which the article calls “a first for Mack”; the transmission controls have moved to a stalk on the steering column. A 3-way adjustable tilt and telescoping steering column and Mack Command Steer are optional. The seat has an all-new frame, a wide seat foam and wrap-around bolsters, with options for heating, cooling and massage and a choice of fabric, vinyl or leather; the product page lists heating, massage and ventilation functions and, in a second entry, heating, cooling and massage functions as options, together with an information and entertainment panel. Charging ports are marked with an X throughout the cab and living space.

The design article describes three options for the living area. The short option has no cabinetry and a flat-back bed; the medium option has cabinets and a reclining bunk with an inclined upper section; the long option has more cabinetry, a large wardrobe cabinet and a Versa bunk whose mattress rotates up onto the sleeper’s rear wall, after which a table folds down from the wall and the seats rotate up to form a workspace. Yates says the Granite can accept a sleeper in the same manner as the highway truck because there is no longer a transition panel. The product page names one sleeper, the 44-inch mid roof.

Engines

The product page pairs the 2027 Mack MP13 with the mDRIVE HD gearbox as an integrated powertrain and claims “More power, and up to 3% greater fuel efficiency” over a Granite with the MP8 engine; a footnote adds “Depending on fuel cycle of specific application.” Mack’s article “Boosted Power and Performance” calls the engine the EPA27 MP13 and says the design team focused on meeting the EPA27 emissions standards. According to Kevin West, Mack’s Senior Product Manager for Vehicle Propulsion, the engine has a new high-pressure fuel pump and increased cylinder pressure, a “compressed graphite block”, a compression ratio of 20:1, a new turbocharger with a ball-bearing wastegate, and a seven-wave piston bowl with dividers added between the initial waves. The article gives a new rating of 540 hp with torque maintained at 1,950 lb-ft, and West says the engine can be lugged longer and down to a lower rpm than before.

The same article reports engine braking improved by over 20 percent, with a maximum of over 630 braking horsepower from a pre-turbine throttle, against “the previous 505 braking horsepower rating”. Engine brakes are explained in retarders and engine braking.

The Cummins X10 is the second engine. The product page gives it 10 litres, up to 450 hp and 1,650 lb-ft; the article gives 350–450 hp and 1,250–1,650 lb-ft and pairs it with Allison 3000 and 4000 Series gearboxes. Mack gives power in horsepower and torque in pound-feet; no document opened gives kilowatt or newton-metre figures, cylinder counts, rated speeds or any MP13 rating other than the 540 hp maximum. The new Granite’s product page lists no natural-gas engine.

Transmissions

The product page lists two gearbox families: the Mack mDRIVE HD automated manual and the Allison RDS Series 6-speed automatic. Automated manual gearboxes are explained in automated manual transmissions.

Mack says the mDRIVE HD uses new hardware sensors and updated valves to improve gear shifting. The March 2026 article describes a faster communication link between the transmission and the engine and shifting with an emphasis on downshifting to ensure maximum engine braking, and West says the valves in the transmission control module were reworked. With the creep mode engaged, the truck starts to move slowly forward at idle speed once the driver takes a foot off the brake, without the throttle pedal being pressed. West describes the truck walking up a 22 percent grade with a load of stone with the feature engaged. The article pairs the Cummins X10 with Allison 3000 and 4000 Series gearboxes, while the product page lists the Allison RDS Series. No document opened lists a manual gearbox for the new Granite.

Axles, suspension and chassis

The product page lists five axle configurations, 4x2, 6x4, 8x4, 8x6 and 10x4, and the front axle in an axle-forward or axle-back position; wheel formulas are explained in axle configurations. The front axle is Mack’s, and the drive axles are Mack or Meritor. The heavy-duty frame rails are, in Mack’s words, “Engineered specifically for maximum payload and vocational demands”; custom frame rails and roll stability advantage are optional.

Under “Engineered for every obstacle.” the product page lists three videos titled Power Leash, Grade Gripper and Rock Free, without a text description of them. No document opened gives axle ratings, wheelbases, a gross vehicle or combination weight rating, a kerb weight, overall dimensions, the brake type, or fuel and DEF tank capacities for the new Granite.

Safety and driver-assistance systems

Mack Protect is standard. Mack says the suite uses radars and cameras, alerts the driver to road hazards and intervenes with braking, engine control and corrective steering when the truck drifts from its lane. The product page’s standard safety list names frontal collision and rollover protective actions, forward collision warning, adaptive cruise control, automatic emergency braking, lane departure warning, Traffic Stop and Go, front and side pedestrian detection and Road Sign ID. A frontal airbag is standard and side curtain airbags are optional. The optional list adds the Mack Protect Pro and Mack Protect Premier suites, an advanced tyre pressure monitor system, and front and side pedestrian detection, which also appears in the standard list.

Mack CommandView uses multiple cameras to give the driver 360-degree visibility and to monitor the payload through a function Mack calls Weight Management. The tyre pressure monitor system uses in-tyre sensors for pressure and temperature and shows the readings on the infotainment screen and the instrument cluster. If an airbag deploys or a rollover is detected, E911 Auto Call places an automated call to emergency services.

Connectivity and body integration

Mack Connect gathers performance data, location tracking and operational analytics in one dashboard, and the MyMack mobile app is included for five years with the truck. Software is updated over the air. For bodybuilders, the product page lists a body-ready electrical system as standard and Mack BodyLink IV, a chassis-to-body electrical integration system that can be tailored to each bodybuilder’s needs.

Earlier generation: the Legacy Granite

The Legacy Granite page rates the truck in Class 8 with a GVW of 35,000–92,000 lbs and a GCW of 80,000+ lbs, and gives the front axle in an axle-forward or axle-back position. It lists seven axle configurations: 4x2, 6x2, 6x4, 8x4 with pusher axle, 8x6, 10x4 with pusher axle, and 10x4 with pusher and tag axle.

The page’s summary block gives 345–505 hp and 1,350–1,850 lb-ft, which differs from the 320–505 hp and 1,000–1,900 lb-ft across its engine list. The Cummins L9N is listed for the 6x4 axle-back truck only. Gearboxes are the mDRIVE HD automated manual with 12, 13 or 14 speeds, the Allison RDS Series 6-speed automatic and Eaton-Fuller manuals with 10, 11, 13 or 18 speeds; the gearbox types are set out in truck gearbox types. The front axle is Mack’s and the drive axles are Mack, Meritor or Dana Spicer. Suspensions are the mRIDE and Mack Camelback leaf, the Mack AL, Hendrickson Primaax EX and Neway ADZ air, and the Hendrickson Haulmaax EX rubber suspension.

The Legacy page’s standard exterior list carries the same thirteen items as the new page’s, which adds the ImpactShield windshield. The cab is galvanised steel on the Cornerstone chassis, with Bendix integrated safety systems and Command Steer. Inside, a Mack Co-Pilot 5-inch full-colour display and a 7-inch touchscreen with Siri and Apple CarPlay integration sit in a wraparound dash with oversized, laser-etched switches. The seats, designed with Sears Seating, come in more than 30 feature and fabric combinations, with ToggleLink air suspension and a swivel base among the options. Mack says the heated LED headlights increase forward visibility by up to 29% and side visibility by up to 50%, without stating the reference. The standard interior list also names power windows and locks, illuminated instrument panel controls, digital analog gauges, a non-slip electronics tray, oversized cup holders, an air-suspension driver’s seat and a high-performance HVAC system.

Source notes

Mack’s Granite page, read on 8 November 2026, for the all-new Granite: Class 8; Mack MP13, 13 l, 540 hp max and 1,950 lb-ft max, named as the 2027 MP13; Cummins X10, 10 l, 450 hp max and 1,650 lb-ft max. mDRIVE HD automated manual in 12- and 13-speed direct and overdrive, 13-speed creeper and 14-speed ultra-low creeper versions; Allison RDS Series 6-speed automatic. Axle-forward and axle-back day cabs, each with a 113.5 in BBC and a 44-inch mid roof sleeper option; axle configurations 4x2, 6x4, 8x4, 8x6 and 10x4; Mack front axle, Mack or Meritor drive axles; MaxRide and Hendrickson HAS air, mRIDE and Mack Camelback leaf, and Hendrickson Haulmaax EX rubber suspensions. Mack’s magazine, March 2026: EPA27 MP13 with a 20:1 compression ratio and over 630 braking hp from the engine brake, against a previous 505; Cummins X10 at 350-450 hp and 1250-1650 lb-ft with Allison 3000 and 4000 Series gearboxes; door opening 3.5 in wider fore and aft and 1 in taller. Legacy Granite page, read on the same day: GVW 35,000-92,000 lbs, GCW 80,000+ lbs; MP7, 11 l, 325-425 hp and 1,250-1,550 lb-ft; MP8, 13 l, 415-505 hp and 1,650-1,900 lb-ft; Cummins L9N CNG, printed as 12 l, 320 hp and 1,000 lb-ft, 6x4 axle-back only; the page’s summary gives 345-505 hp and 1,350-1,850 lb-ft. No Mack document opened gives engine output in kilowatts, torque in newton-metres, a launch date, a kerb weight, overall dimensions, wheelbases or tank capacities, or a GVW or GCW for the new Granite.