2024 Kenworth T680

Duty cycle shows up in the odometer, 375,110 miles puts it into a highway-use bracket where aero spec and sleeper comfort typically matter more than low-speed vocational wear. Condition is used, so the value is in verifying maintenance history, aftertreatment service intervals, and any downtime patterns tied to sensors, DEF dosing, or regen frequency. Powertrain details are not provided, so the inspection focus should stay on what can be confirmed, cold start behavior, blow-by level at the breather, coolant condition, and any oil seep at the front cover, valve cover, and turbo oil feed and return. Transmission and driveline checks should center on clutch take-up feel if manual, shift quality under load, U-joint play, carrier bearing condition, and driveline angle related vibration, plus differential leaks at the input and axle seals. Frame rails and suspension points are where real work shows, look for rail flange cracking near suspension hangers, crossmember fastener integrity, and any evidence of prior straightening or heat marks. Fifth wheel top plate wear, slider rail condition, and air line routing tell you how it was coupled and how often it was moved, check for jaw wear, locking test, and air leaks at the trolley lines. Cab interior and sleeper components should be judged on high-touch wear, seat base play, pedal pad wear, and dash switch function, then confirm HVAC output, bunk controls, and any warning lamps at key-on. Brake and tire condition should be documented by remaining lining depth, rotor or drum heat checking, air system build time, and leak-down rate, with a close look at steer tire edge wear for alignment or kingpin issues. Serial number 1XKYD49X4RJ371785, stock 0630674.