2026 Mack GR64B

Vocational chassis application points to rolloff and hooklift duty cycles, short-trip stop and go work, and frequent PTO engagement, mileage shows it has not been put into service. Condition is listed as new, so the practical focus is initial setup, body upfit alignment, and confirming all build sheets match the intended container size and rail height. Powertrain information is not provided, so engine family, transmission model, PTO provisioning, and axle ratio cannot be verified from the data. Serial number 1M2GR4GCXTM053096 and stock number 70777 are the identifiers to pull OEM spec, emissions family, and any factory PTO wiring, frame RBM, and wheelbase details before pairing it to a specific hoist brand. Frame rails should be checked for correct hole patterning and any upfit drilling, clean paint at the top flange, and straightness at the rear overhang where hoist loads concentrate. Cab controls should be verified for PTO switch location, any prewire for hoist controls, and dash indicator functionality, especially interlocks tied to park brake and neutral. Hydraulic routing points, battery box access, and rear lighting harness slack are worth confirming early, since rolloff installs often stress loom support and rub points if clamps and grommets are missed.