2021 Kenworth T880

Duty cycle. 391,000 miles on a conventional daycab points to steady vocational or regional work rather than low-mileage local service, with the kind of wear you typically see at cab entry points, steering components, and driveline joints. Serial 1XKZD49X2MJ460297, stock 0631795. Powertrain. Engine, transmission, axle ratio, and any PTO or wet kit setup are not provided, so application fit depends on verifying the build sheet and ECM data. ECM hours and idle percentage are key on a daycab at this mileage, along with regen history if emissions-equipped. Frame rails. Rail tops and flange edges should be checked for added holes, cracks around suspension hangers, and signs of previous body or equipment mounting. Fifth wheel condition comes down to plate wear, slider operation, and air line routing, plus evidence of grease maintenance and any jaw or lock wear. Cab and chassis wear points. Door hinges, steps, and seat base usually tell the truth on a used vocational daycab, with pedal wear and steering wheel shine backing up the mileage. Front end inspection should focus on kingpins, tie rod ends, drag link, and steer tire wear pattern, then move to driveline carrier bearings, U-joints, and air system integrity, including air dryer service history and brake chamber condition.