2026 Mack GR64B

Category, Truck (rolloff, tri-axle). Utility points to heavy vocational cycles, rolloff work favors short, repetitive routes with high PTO and hydraulic demand, 1 mile and new condition indicates no established duty history yet. Powertrain centers on a Mack MP8 rated at 455 hp tied to an Allison 4500 RDS 6-speed automatic, a combination that suits stop and go collection and controlled low-speed maneuvering. Gearing at 4.50 with a 66,000 GVWR and 20k front, 46k rear package targets startability under load and steady pull in the lower ranges rather than high-speed cruise. Rear suspension uses Mack Camelback multileaf SS46 at 46,000 lb, a vocational setup built for rolloff body weight transfer and uneven yard entrances. Wheelbase at 251 inches leaves room for hoist and rail length while keeping turning manageable for container placement. Frame and running gear should be checked at delivery for upfit alignment, hoist subframe contact points, and any paint rub at rail clamps, especially around crossmember fasteners and rear suspension hangers. Cab and controls on an automatic vocational spec should be verified for PTO interlock logic, dash switch labeling, and any upfitter wiring terminations before the first loaded cycle.