2020 KENWORTH T680 Tandem Axle Sleeper – MX-13 | ENDURANT 12-SPD | ENGINE REPLACED (2022 BLOCK) Unit #31064 | VIN: 1XKYDP9X4LJ395139 | 578,328 Miles (Odometer) OVERVIEW This 2020 Kenworth T680 tandem axle sleeper is a prior TForce Freight fleet unit that was taken out of service and is now being offered as fleet surplus. The T680 is one of the most sought-after over-the-road platforms in today’s market, known for its fuel efficiency, driver comfort, and long-haul reliability. This unit is equipped with the PACCAR MX-13 engine and Endurant 12-speed automated transmission, a highly desirable combination for both fleet operators and independent buyers. Key Value Highlight: The original engine (S/N: Y203476) has been replaced with a 2022 model cylinder block (S/N: Y184012R). While the seller does not have documentation for the install date or mileage on the replacement, this represents a significant upside component for the next owner. The truck starts and runs, but does present active fault indicators and gauge irregularities (outlined below). This is a high-upside, fix-and-run opportunity for a buyer looking to acquire a late-model sleeper at a discounted acquisition cost. KEY SPECIFICATIONS Make / Model: Kenworth T680 Year: 2020 Configuration: Tandem Axle Sleeper Tractor VIN: 1XKYDP9X4LJ395139 Mileage: 578,328 (odometer) POWERTRAIN & DRIVELINE Engine: PACCAR MX-13 Diesel Original Engine S/N: Y203476 (removed) Replacement Cylinder Block: 2022 Model – S/N: Y184012R Estimated HP Range: 405–510 HP Estimated Torque: Up to 1,850 lb-ft Transmission: Endurant 12-Speed Automated Manual Transmission PACCAR / Eaton Endurant Platform No clutch pedal operation Designed for fuel efficiency and optimized shift logic Axle Configuration: Tandem Fleet-spec ratio (exact ratio unknown – verify via VIN if required) CHASSIS & EXTERIOR Aerodynamic T680 Sleeper Design Tandem Rear Axles Air Ride Suspension Dual Fuel Tanks (verify via photos) Aluminum Wheels (verify via photos) CAB & INTERIOR Raised Roof Sleeper Configuration Air Ride Driver Seat Multi-Function Steering Wheel Integrated Digital Display Standard Kenworth Fleet Interior Climate Control System OPERATIONAL NOTES Unit starts and runs Active fault message: “Connect Engine Service Tool” Oil pressure gauge issue: Reads over 100 PSI and does not move during operation (see videos) Seller does not have documentation for engine replacement date or mileage on replacement engine Important: This unit will require diagnostic evaluation and repair prior to being placed back into service. TMJ AUCTIONS RECOMMENDATION From an asset perspective, this truck checks several high-value boxes: 2020 model year sleeper (strong resale demand) Tandem axle configuration (versatile and revenue-capable) Endurant 12-speed transmission (modern, fuel-efficient platform) Engine replacement already completed (major cost component addressed) With that said, the active fault and gauge issue must be addressed, making this an ideal acquisition for: Owner-operators with mechanical capability Fleets with in-house maintenance Buyers targeting margin through repair and redeployment Bottom Line: Units like this typically command strong retail pricing once operational. This is an opportunity to buy below market, correct known issues, and capture that spread. BIDDER INSIGHT (READ BEFORE BIDDING) Engine replacement adds value, but no mileage documentation is available Fault code and oil pressure reading require proper diagnosis Truck is being sold in as-is fleet condition No assumptions should be made regarding road-readiness TITLE & TRANSFER A clean title signed by the seller will be provided. TMJ Auctions does not transfer titles. Buyer is responsible for completing title transfer. PICKUP & REMOVAL Buyer is responsible for all loading and transportation Unit may require repair prior to driving off location WHY THIS UNIT WILL ATTRACT BIDS Late-model (2020) sleeper truck Tandem axle = broader buyer pool MX-13 / Endurant 12-speed = preferred modern spec Engine replacement already completed Priced to reflect known issues = upside opportunity Well-positioned units like this consistently generate strong bidding activity—especially when buyers recognize the margin opportunity. 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