2023 Mack AN64T70

Duty cycle profile, 356,000 miles shows steady utilization and points toward highway or regional linehaul service rather than low-mile vocational work. Service history and idle time matter at this mileage, so a cold start check, blow-by at the breather, and regen frequency review are the first tells on how it was run. Powertrain, engine family, transmission model, and rear ratio are not provided, so performance and fuel economy intent cannot be tied down from the listing alone. ECM details are blank, so verifying engine hours, idle percentage, fault history, and aftertreatment counters through a download is a key step before assigning value. Frame rails, look for straightness at the front horns, any added holes, and corrosion around crossmembers and suspension hangers. Fifth wheel, check jaw wear, slider rail condition if equipped, and air line routing for chafe. Cab and sleeper, inspect seat base play, pedal wear versus stated miles, HVAC operation, and any coolant smell in the sleeper area that can hint at heater core seepage. Brakes and tires, measure remaining lining, check rotor or drum heat checking, and look for uneven tire wear that can indicate alignment, bushing wear, or a bent component. Electrical and air system, listen for air leaks at the dash valves and gladhand seals, confirm compressor build time, and check battery box mounts and cable ends for corrosion or loose lugs.