International HX620 vs. Mack Granite: Tri-Axle Dump Truck Comparison for Site and Demolition Fleets

Sep 29

6 min read

If your dump truck shortlist has narrowed to two names, there's a real chance those names are International and Mack. Both build genuinely capable severe-duty conventional trucks purpose-built for construction, demolition, and site-prep hauling, and both have loyal followings among contractors who will argue their brand all day. We're not here to settle that argument, we're here to put the International HX620 and the all-new Mack Granite side by side on the specs that actually decide which one fits your operation.

Engine Options: More Flexibility on the International Side

International builds the HX series around its own S13 Integrated powertrain as the standard option, a 12.74-liter engine rated from 400 to 515 horsepower and 1,450 to 1,850 lb-ft of torque. For fleets wanting more headroom, International also offers the Cummins X15 as an alternative in the HX, opening up a 430 to 605 horsepower range and 1,650 to 2,050 lb-ft of torque, a genuinely wide spread that lets a buyer tune the truck from efficient regional hauling all the way up to serious quarry-grade pulling power.

International S13 (standard): 400-515 hp, 1,450-1,850 lb-ft torque

International HX with Cummins X15 (optional): 430-605 hp, 1,650-2,050 lb-ft torque

Mack keeps things simpler on the Granite: the MP13, Mack's own 13-liter engine, tops out at 540 horsepower and 1,950 lb-ft of torque, and a Cummins X10 is also available as a lighter-weight 10-liter alternative rated up to 450 horsepower and 1,650 lb-ft. Mack's approach trades some of International's top-end ceiling for a tighter, proven two-engine lineup that keeps parts and service simpler for a fleet that doesn't need the widest possible spread.

Mack MP13 (standard): up to 540 hp, up to 1,950 lb-ft torque

Mack Cummins X10 (optional): up to 450 hp, up to 1,650 lb-ft torque

Transmissions and Weight Class

International's HX gives buyers real choice in the driveline: the T14 14-speed automated manual transmission, Eaton manual options across 8LL, 9LL, 13-speed, and 18-speed configurations, or Allison automatics in the 4000, 4500, and 4700 series. GVWR runs from 52,000 up to 92,000 lbs across the HX520 and HX620 configurations, giving the platform genuine range from lighter tandem work up to the heaviest tri-axle and quad-axle setups.

Mack's Granite runs on the mDRIVE HD automated manual, available in 12-, 13-, or 14-speed variants, or the Allison RDS Series 6-speed automatic, a slightly narrower transmission menu than International's, but one built specifically around the Granite's own driveline calibration. Axle configurations span 4x2, 6x4, 8x4, 8x6, and 10x4, covering the same tandem-through-tri-axle range most dump truck fleets actually need.

Which Truck Fits Which Operation

If your fleet runs a genuinely mixed workload, some lighter regional hauling, some heavy quarry or demolition-debris runs, and you want one platform that can be spec'd wide enough to cover both without switching brands, International's S13-to-X15 spread gives you that range inside a single HX order. A demolition contractor hauling concrete and masonry debris out of dense urban teardown sites, where load weight varies job to job, benefits directly from that flexibility.

If your operation runs a more consistent duty cycle, heavy aggregate or site-prep hauling day in and day out, the Granite's tighter, purpose-built MP13 driveline and Mack's ground-up 2026 vocational redesign, the brand's biggest since 2001, is worth serious consideration. A general contractor or site-prep company running a fleet of similarly-loaded tri-axle trucks often gets more value from Mack's simplified, deeply integrated powertrain than from International's broader menu of options they'll never actually use.

The Real Rent-vs-Own Case for a Demolition or Site-Prep Fleet

Whichever badge you choose, renting a tri-axle dump truck for ongoing demolition or site-prep work is the expensive option over any real time horizon. A contractor bidding recurring debris-hauling or aggregate contracts needs trucks that are available on the fleet's schedule, not a rental company's, and every dollar spent on rental fees builds zero equity toward the next truck. Financing an International HX620 or Mack Granite properly gets a contractor to full ownership of an asset that keeps earning long after a rental agreement would have expired. And unlike lenders who require one truck fully paid off before they'll talk about the next purchase, BFC can help a growing demolition or hauling fleet finance its next tri-axle truck while the current one is still on the books.

Cab Comfort and Driver Retention

With the CDL driver shortage still squeezing fleets nationwide, cab comfort and driver experience have become genuine business considerations, not just nice-to-haves. Both International and Mack have invested real engineering into driver-facing improvements on these platforms in recent years, International's Diamond Logic electrical architecture supports a cleaner, more configurable dash and control layout across the HX lineup, while Mack's redesigned Granite cab, part of the brand's biggest vocational overhaul since 2001, was built with driver ergonomics and visibility specifically in mind. A fleet struggling to retain drivers in a competitive labor market should weigh cab comfort as a real factor in this decision, not an afterthought after the engine and transmission numbers are settled.

Telematics and Uptime Monitoring

International's Diamond Logic system extends beyond electrical wiring into genuine diagnostic and configuration capability, giving fleet managers visibility into a range of vehicle systems without needing to physically inspect the truck. Mack counters with GuardDog Connect, now integrated with the Granite and Keystone from the factory, delivering predictive fault detection and real-time uptime data through Mack's OneCall platform, backed by real reported results, Mack has cited over 150,000 OTA software updates delivered and a 95 percent predictive-fault certainty rate through the system as of early 2026. Both approaches aim at the same goal, catching a developing mechanical issue before it strands a loaded truck mid-route, and a fleet already standardized on one brand's telematics ecosystem may find that consistency alone tips the decision in that direction.

Matching the Right Truck to a Florida Demolition or Aggregate Operation

South Florida's demolition and site-prep contractors run some of the most varied dump truck duty cycles in the country, from clean urban teardown debris one week to heavy limerock aggregate hauling the next. That variability is exactly the scenario where International's wider engine spread, from the S13's baseline 400 horsepower up through the Cummins X15's 605-horsepower ceiling, gives a single-brand fleet more flexibility to match individual trucks to individual contracts without carrying two different chassis brands. A more specialized aggregate-focused operation running a consistent heavy load profile day after day, on the other hand, may get more value from the Granite's tighter, purpose-built MP13 driveline and Mack's dedicated 2026 vocational redesign.

Parts Availability and Dealer Density in South Florida

Both International and Mack maintain solid dealer networks across Miami-Dade, Broward, and Palm Beach counties, but availability can still vary truck to truck and part to part depending on your specific dealer relationship. Before committing to either brand for a growing fleet, it is worth asking your local dealer directly about typical parts lead time on common wear items, brake components, filtration, and driveline parts specifically, rather than assuming national brand reputation translates evenly to every regional dealer's actual inventory depth.

A fleet already running one brand for other equipment, excavators, loaders, or existing trucks, may also find real value in standardizing dump truck purchases around that same brand's dealer relationship, since an established parts account and service history with one dealer group often translates into faster turnaround than starting a new relationship with an unfamiliar dealer, even if the truck itself is a strong fit on paper.

Whichever way you lean, take both trucks for a real demo run loaded, not empty, before signing anything. Torque delivery, cab noise, and visibility all feel different under an actual working load than they do on an empty lot test drive, and that difference is exactly what your drivers will experience every single day once the truck is in service.

Ready to move on your next tri-axle dump truck? Visit our home page, apply for financing, browse our equipment for sale and financing inventory, or subscribe to the BFC blog for more coverage like this.