2026 Mack GR64F

Category, Truck (Dump), tandem axle vocational spec with 66,000 GVWR and delivery miles showing 21 on the clock. Utility centers on short-cycle hauling where start, stop, and grade work matter, 222-inch wheelbase keeps it stable with a loaded body while still fitting jobsite turns. Axle ratings at 20k front and 46k rears point to legal payload focus with room for front-end equipment and heavy material. Powertrain pairs a Mack MP7 rated at 425 hp with a Mack mDRIVE HD 13-speed (TMD13AFO-HD) including creeper and multi-speed reverse in overdrive, a setup aimed at controlled backing, slow-speed positioning, and keeping the engine in its working band under load. Rear gearing at 3.98 favors pull-away torque and grade holding over high-speed cruise. Running gear uses an SS46 Mack Camelback multileaf 46k suspension, a traditional vocational spring pack that tolerates uneven ground and point loading better than air setups, with fewer height control parts to manage. Chassis identifiers include serial 1M2GR2GC8TM053540 and stock 70966 for fleet tracking and service file setup.