2023 Kenworth T680

Duty cycle shows up in the odometer, 368,500 miles points to highway time and steady utilization, the kind of service where cooling system health, aftertreatment performance, and driveline lash tend to tell the story. Serial 1XKYD49XXPJ268609 and stock 0629621 give a clean reference for service history, recalls, and any OEM campaign work. Powertrain details are not provided, so application fit comes down to inspection basics, check for blow-by at the breather, oil seep at the front cover and rear main area, charge-air piping residue, and any coolant staining around the surge tank and hose ends. Aftertreatment condition matters at this mileage, verify DPF differential pressure trends, regen frequency, and any stored or inactive fault history through a scan, ECM hours and idle percentage should be pulled to confirm how the miles were accumulated. Frame rails and crossmembers should be checked for straightness, corrosion at fastener points, and any witness marks from prior modifications. Fifth wheel condition is a wear indicator, look for jaw wear, top plate cracking, and slider rail slop if equipped. Cab upholstery and sleeper trim will show how the truck was lived in, pay attention to pedal wear, seat base play, HVAC function, and any dash warning lamps that cycle on at key-on. Running gear inspection should focus on steer tire edge wear, kingpin play, and air system recovery time. Driveline and rear suspension should be checked for u-joint looseness, carrier bearing noise, air bag cracking, and brake chamber pushrod stroke, with a close look at rotor or drum condition and ABS wiring at the wheel ends.