Keystone™
- class
- 8
- heavy duty
- power
- 540
- hp max
- torque
- 1,950
- lb-ft max
The one truck that owns every lane.
Outhaul. Outwork. Outlast.
All-new galvanized steel cab
A reinforced structure resists corrosion and withstands the elements, delivering superior durability, enhanced safety protection, and long-lasting quality that ensures reliable performance for years to come.
ImpactShield windshield
With 2x the impact resistance and 5x scratch resistance, the available ImpactShield windshield extends service life and can reduce total cost of ownership.
Construction-grade frame
Keystone is built on a battle-tested foundation that brings construction-grade strength and durability to handle extreme loads.
Heavy-duty frame rails
Engineered specifically for maximum payload demands.
Maneuver every turn, terrain, and trail.
Higher ground clearance
Vocational tractors routinely face rutted dirt roads, rocky terrain, and unpredictable jobsite conditions. Keystone is built with higher ground clearance and rugged off-road capability to help operators tackle these obstacles and prevent damage across demanding work environments.
Available Mack® Command Steer
This optional feature delivers precise handling on everything from icy highways to rutted dirt roads while reducing driver effort by 85%.
MaxRide™ air suspension
Advanced suspension utilizes electronically controlled rear suspension with eight tuned airbags to provide the most stable ride on a Mack Truck, no matter how rough the terrain gets.
Shorter bumper to back of cab & bumper to front axle
Shorter bumper to back of cab and bumper to front axle from previous models improve handling and visibility.
Where the road ends, safety continues.
Available Mack Protect™ Safety Suite
Utilizing radars and cameras, Mack Protect alerts the driver to potential road hazards and intervenes with braking, engine control, and even corrective steering to guide drivers back into proper lane position when drifting is detected.
Digital Mirror System
The optional DMS combines dual camera wings and interior high-resolution digital displays to provide clear, real-time views that replicate traditional mirrors for enhanced visibility and safety.
Forward & side pedestrian detection
Navigate cities and jobsites safely with optional radar technology that detects and alerts for vulnerable road users like pedestrians, motorcyclists, and cyclists.
New truck.
New powertrain.
Powering the all-new Keystone™ is our latest integrated powertrain. See what makes the 2027 MP®13 engine and mDRIVE™ transmission more powerful and fuel efficient than ever.
Explore Mack Keystone
Next-level connectivity.
Mack Truck Builder
Customize your own Keystone from the ground up with our digital truck builder experience.
Specs & Downloads
Warranty & Extended Coverage Plans
Purchase & Financing
Base Configurations
CLASS
8
MAX HORSEPOWER
540 hp
MAX TORQUE
1,950 lb-ft
Cab Configurations
Axle-forward day cab
Roof fairing available in 12'6” or 13'6” overall height.
Axle-forward 44-inch sleeper
Roof fairing available in 13'6” overall height.
Axle-forward 64-inch sleeper
Roof fairing available in 13'6” overall height.
Axle-back day cab
Roof fairing available in 12'6” or 13'6” overall height.
Axle-back 44-inch sleeper
Roof fairing available in 13'6” overall height.
Axle-back 64-inch sleeper
Roof fairing available in 13'6” overall height.
Axle Configurations
4x2
6x4
8x4
8x6
Engines
MP®13
13 liter
540 hp max
1,950 lb-ft torque max
Transmissions
AUTOMATED MANUAL
mDRIVE™
OPTIONS
12-speed direct and overdrive
13-speed OD for Dynamic Overdrive
13-speed creeper and multi-speed reverse available
AUTOMATED MANUAL
mDRIVE™ HD
OPTIONS
12- and 13-speed direct and overdrive
13-speed OD for Dynamic Overdrive
13-speed creeper and multi-speed reverse available
14-speed ultra-low creeper and multi-speed reverse available
AUTOMATIC
Allison RDS Series
OPTIONS
5-and 6-speed
Axles
FRONT AXLE
Mack
DRIVE AXLE
Mack
DRIVE AXLE
Meritor
DRIVE AXLE
Dana Spicer
Suspensions
AIR
Hendrickson HAS™
RUBBER
Hendrickson Haulmaax EX
Standard features
Exterior features
Interior features
Optional Features
EXTERIOR
ImpactShield Windshield
EXTERIOR
Heated Aerodynamic Hood Mirrors
INFORMATION
Backup Camera with Input for Auxiliary Cameras
INTERIOR
Customizable Driver Sleeper Configurations
LIGHTING
LED Fog Lamps and Cornering Lamps
MIRRORS
Digital Mirror System (DMS)
SAFETY
Advanced Tire Pressure Monitor System (TMS)
SAFETY
Side Pedestrian Detection
SAFETY
Mack Protect™ Pro and Mack Protect™ Premier Safety Suites
SAFETY
Side Curtain Airbags
STEERING
3-Way Adjustable Tilt/Telescoping Steering Column
SEATING
Available Heating, Cooling, and Massage Seat Functions
STEERING
Mack® Command Steer
SUSPENSION
MaxRide™ Air Suspension
Downloads
Warranty
More than warranty protection. Peace of mind with comprehensive warranty coverage.
Extended coverage plans
Lock in parts and labor costs with plans that cover powertrains, after treatment systems, chassis, clutches and towing at today’s prices.
Finance on your terms
Mack Financial Services provides the support you need to build your business.
Discover the power of Mack Certified.
We build trucks for a lifetime of hard work. That means a Mack Certified used truck is one of the best values on or off the road.
