Commercial Truck Axle
Mack Axles (proprietary, Volvo Group)
Mack (Volvo Group) · Drive axle · 46,000 lb GAWR
Class 8
In production
Drive
Manufacturer
Mack (Volvo Group)
Type
Drive
GAWR
46,000 lb
Class
Class 8
What this axle does
Mack Axles are Volvo Group's proprietary axle line for Mack trucks — Volvo and Mack share axle technology under the Volvo Group umbrella. Mack-branded steer and drive axles, fitted as standard to all modern Mack trucks. Integrated with Mack MP8 engine and mDRIVE transmission. The 'Volvo Powertrain' philosophy means Mack/Volvo trucks have tightly-integrated engine + transmission + axle combinations — different from the Daimler approach (mix-and-match Dana/Meritor available).
Specifications
- Manufacturer
- Mack (Volvo Group)
- Type
- Drive
- GAWR
- 46,000 lb
- Ratio options
- 2.47, 2.64, 2.85, 3.08, 3.42, 3.73, 4.10
- Truck class
- Class 8
- Production
- 2007–present
- Applications
- Mack Anthem (highway), Granite (vocational), Pinnacle (regional)
Design and engineering
Steer axles, single-drive, tandem-drive variants. Volvo Group engineering. Wide ratio range for highway and vocational.
Generations and major changes
- Mack Axles (2007–present)Long production run as Volvo Group proprietary.
Reliability and longevity
Strong reliability — Volvo Group engineering. Service network is the Mack dealer network.
Common problems
Standard pinion seal and differential lube issues.
Maintenance schedule
Differential lube every 200K-250K miles (synthetic).
Pros and cons
Pros
- ✓Integrated with Mack MP8 + mDRIVE
- ✓Volvo Group engineering quality
- ✓Mack dealer support
Cons
- !Limited to Mack trucks (not cross-brand)
- !Volvo / Mack share platform — may be confusing for parts orders
Resale value impact
Standard for Mack trucks.
Trucks that use this axle
Related
Frequently Asked Questions
What is the Mack Axles (proprietary, Volvo Group) GAWR?
The Mack Axles (proprietary, Volvo Group) is rated for 46,000 lb Gross Axle Weight Rating (GAWR). GAWR is the maximum weight the axle can support, including the chassis, suspension, body, and payload distributed to that axle. For a tandem-drive configuration, the rating is the combined capacity of both rear axles. Steer axles typically range 12,000-22,000 lb depending on application; tandem drives range 38,000-58,000 lb.
What gear ratios are available for the Mack Axles (proprietary, Volvo Group)?
The Mack Axles (proprietary, Volvo Group) offers these ratio options: 2.47, 2.64, 2.85, 3.08, 3.42, 3.73, 4.10. Lower numerical ratios (e.g., 2.47, 2.64) are taller — better for highway fuel economy at the cost of acceleration. Higher numerical ratios (e.g., 4.10, 4.56) are shorter — better for vocational/severe-duty starts and grade-climbing at the cost of highway fuel economy. Fleet spec engineers select the ratio based on average loaded weight, terrain, and target cruise speed.
What's the difference between a single drive and tandem drive axle?
A single-drive axle has one driven rear axle — typical of Class 6-7 medium-duty trucks. A tandem-drive axle has two driven rear axles connected via an inter-axle differential — typical of Class 8 trucks. Tandems provide more traction, allow heavier loads (40,000-58,000 lb combined GAWR vs 23,000-32,000 lb single-drive), and better handle severe-duty/loose-surface conditions because both rear axles can drive. The trade-off: more weight, more cost, more components to service.
How long should the Mack Axles (proprietary, Volvo Group) last?
For highway-duty Class 8 axles, expect 1,000,000+ miles before major hypoid gear or pinion overhaul, with proper synthetic-lube service intervals (every 250,000 miles). Vocational/severe-duty axles see 600,000-800,000 miles before similar service due to higher load cycling and frequent inter-axle differential lockout engagement. Steer axles last similarly long for the bearings and gears, but king-pins typically need replacement at 750,000-1,000,000 miles in highway use (500K-700K in severe-duty).
How do I know if my axle needs service?
Warning signs: differential lube leak at the pinion seal (visible under the rear of the truck), hypoid gear noise (whine that varies with throttle), wheel bearing growl (changes pitch with speed), king-pin slop (steering wander or clunking on turns). For preventive: pull a lube sample at every PM service and have it analyzed — metal content trending up signals internal wear before it becomes a failure. Most fleets pull samples at 100K and analyze every 250K.
Can I swap a Dana axle for a Meritor (or vice versa)?
Generally yes for the same GAWR class — both manufacturers build to similar SAE specifications for major dimensions, suspension mounting points, and brake mounting. However: ratio options differ, wheel bearings differ slightly, axle shafts are NOT interchangeable, and brake controllers may need to be reconfigured for different ABS sensor patterns. For a fleet swap, plan the cross-reference carefully — many fleets choose to standardize on one supplier (all-Dana or all-Meritor) to simplify parts stocking and tech training.