Used 2016 Peterbilt 389 Day Cab Tractor With Fresh Inframe Cummins ISX 485hp For Sale | One Owner Fleet Maintained

2016 Peterbilt 389 Day Cab Tractor — Cummins ISX 485HP Fresh Inframe | Tandem Axle | One Owner Fleet Maintained | Stock #PTC-38916

A fresh inframe on a one-owner fleet truck is exactly the combination serious buyers spend months hunting. This 2016 Peterbilt 389 Day Cab Tractor delivers both: a 485HP Cummins ISX 15L with a complete in-frame rebuild completed in August 2025, zero miles on the rebuild, a 6x4 tandem axle setup with full lockers, one-owner fleet maintenance, and full service records. Located in King of Prussia, PA, it is built for equipment owners, owner-operators, fleet managers, and other serious Class 8 buyers who want a reliable day cab with documented history and less engine-risk from day one.

This is not a patched-up auction unit with unknown history. Here you can review the truck’s engine, drivetrain, suspension and axle specs, ownership and maintenance record, ideal applications, value retention, financing options, and what to inspect before you buy—details that matter when one major repair or unexpected downtime can erase the value of a cheaper tractor. Call Jay Trevorrow at (973) 886-3020 to schedule your inspection.

The Engine Story: Zero Miles on a Fresh Inframe

The Cummins ISX 15-liter is one of the most field-proven diesel engines in Class 8 trucking history. At 485 horsepower and built for sustained high-torque output, it pulls heavy freight without complaint across long-haul distances and demanding regional routes.

The risk with any high-mileage tractor is deferred engine work. This unit eliminates that risk entirely. The ISX 15L received a complete in-frame rebuild in August 2025. Zero miles on the rebuild. That means new internal components — pistons, rings, liners, bearings — reinstalled in a proven block, tested and running. You are not buying a tractor with 580,000 miles of engine fatigue. You are buying a tractor with a like-new engine in a seasoned, proven chassis.

The Jake Brake is included and functional. On grades, descents, and loaded downhill runs, compression braking protects your service brakes and extends their lifespan. That is not a minor detail — it is a direct operating cost factor over the life of the truck.

Engine Spec Summary:

• Make/Model: Cummins ISX 15L

• Rated Horsepower: 485HP

• Engine Brake: Jake Brake equipped

• Rebuild Status: Complete in-frame rebuild, zero miles, completed 8/25

• Hours on Unit: 20.398

Drivetrain and Configuration: Built for Heavy Loads

The Eaton Fuller 10-speed transmission is the workhorse of the American trucking industry. Millions of miles proven in fleets and owner-operator operations alike. It shifts clean, it holds gear, and when properly maintained, it outlasts the trucks around it. This unit has been fleet maintained — it has not been run hard and put away wet.

The 6x4 tandem axle drive configuration with full lockers gives you the traction confidence that matters when conditions turn against you. Loaded on a wet highway approach or navigating a soft-surface job site exit, full differential lockers keep you moving when other configurations get stuck. That is a real operational advantage, not a marketing bullet point.

Drivetrain Spec Summary:

• Transmission: Eaton Fuller 10-speed

• Drive Configuration: 6x4 Tandem Axle

• Differentials: Full lockers

• Gear Ratio: 3.55

• Wheel Base: 208 inches

Suspension, Axles, and Wheels: Spec That Earns Its Place

Air ride suspension runs the length of this truck. For freight protection, driver fatigue reduction, and extended frame life on long routes, air ride is the correct choice over leaf spring alternatives. This tractor is configured to carry serious weight and absorb serious miles.

The front axle is rated at 13,200 lbs. Rear axles are rated at 40,000 lbs combined. Gross Vehicle Weight is 53,200 lbs. These are working numbers — this truck is rated and built for real freight capacity, not light-duty hauling.

Alcoa aluminum wheels are fitted all around. Alcoa wheels are the benchmark for commercial trucking — lighter than steel, resistant to corrosion, and significantly easier to clean and maintain. Their presence on this truck reflects how it was specified and how it was cared for. Tires are 11R22.5 all around, all in great condition. You are not inheriting a tire bill at delivery.

Axle and Suspension Spec Summary:

• Suspension: Air Ride

• Tare Weight: 17,000 lbs

• GVW: 53,200 lbs

• Front Axle Rating: 13,200 lbs

• Rear Axle Rating: 40,000 lbs

• Wheels: Alcoa aluminum — all positions

• Tires: 11R22.5 — all in great condition

Ownership and Maintenance History: One Owner, Full Records

The fastest way to regret a used truck purchase is to buy based on condition claims with no documentation behind them. One owner. Fleet maintained. History and records available to verify.

This 2016 Peterbilt 389 has not passed through multiple hands, been neglected between owners, or had its service history scattered across operators. A single fleet ran this truck, maintained it on a documented schedule, and has the records to prove it. That history is what separates a calculable investment from a gamble.

A 2018 unit with scattered ownership and zero paperwork is not a better buy than a 2016 with a clean single-owner record and a fresh inframe. Age is not the metric. Documentation and mechanical condition are the metrics. This truck scores on both.

When you call to inspect, ask for the records. They are there.

Ownership Summary:

• Owner History: One owner

• Maintenance: Fleet maintained

• Documentation: History and records available

• Condition Rating: Excellent

What This Day Cab Tractor Is Built For

Operators looking for a versatile, high-capacity Class 8 tractor in a day cab configuration suited to local and regional hauling, without an immediate engine investment, will find this unit directly on target. The fresh inframe means you are starting from zero on engine hours. The proven 389 platform means you are operating a chassis with well-understood maintenance requirements and widely available parts support.

Ideal Applications:

• Long-haul interstate freight

• Regional heavy freight routes

• Tandem axle flatbed and step-deck operations

• Owner-operator single-truck operations

• Fleet replacement or expansion

• Dump trailer, lowboy, and heavy-haul tractor duty

• High-mileage operations where engine rebuild history matters

The 6x4 full-locker configuration makes this unit adaptable to job sites and freight yards where traction demands vary. The 485HP Cummins ISX delivers the torque required for heavy GVW loads without pushing the engine into distress. Day cab trucks are ideal for local and regional hauling. They also let drivers return home after shifts. They offer better maneuverability in urban areas. This platform is also well suited to regional distribution applications and intermodal transport. It is frequently used for retail distribution, flatbed hauling, and construction work. This is a working truck built for operators who need maximum uptime with minimum unplanned downtime.

Why the Peterbilt 389 Platform Holds Its Value

The Peterbilt 389 is not a commodity truck. It is a conventional long-hood tractor with a strong resale market, a loyal operator base, and a reputation for durability that spans decades of production. Parts availability is broad. Technician familiarity is high. Resale demand is consistent. The 389 is also known for extensive customization options.

Buyers who choose a 389 over budget-spec alternatives are not paying for aesthetics. They are paying for a machine with a documented ownership culture built around maintenance and longevity. When you buy a 389, you buy into a category where operators typically hold the truck, care for it, and document the work. The platform is also associated with high-performance engine choices such as the Cummins X15 and PACCAR MX-13, with buyers often comparing Paccar horsepower across available configurations. That is what you are seeing here — a one-owner fleet truck with full records and a fresh engine.

The ISX 485HP Cummins with a complete in-frame rebuild at zero miles on that rebuild is the defining value proposition of this listing. A comparable rebuild performed outside of purchase would run $20,000 to $30,000 in parts and labor. That cost is already absorbed. The work is already done. You arrive at zero-mile engine status without writing a separate check.

Full Specification Sheet

Specification information is provided for the subject truck.

Financing Available — Zero Down, Fast Approval

Owner-operators and fleet buyers both qualify. Financing is available through IronMart's financing partners, and financing provided may be provided or arranged by a third-party lender. Qualified buyers may be eligible for secured commercial financing. Any actual loan payment or actual loan payment amount can vary based on applicant qualifications and terms. This estimate assumes a commercial-use structure. Any loan inquiry or loan transaction is subject to lender review and applicable terms. Consumer financing, if offered, is subject to federal lending laws and additional state restrictions. California residents, Nevada, Vermont residents, and other consumers residing in restricted states may be subject to Vermont lending laws, state licenses, or more state licenses requirements. See required disclosures, including applicable NMLS ID, California finance lender license, equal opportunity lender, and loan solicitation notices; information received may be shared with parties as part of compliance review. Apply fast, get approved fast, and get this truck working for your operation before someone else does.

Financing inquiry: Apply at financehe.com/application

Inspect It. Verify It. Drive It.

This truck is in King of Prussia, PA. Buyers can compare it with other Peterbilt 389 listings, with market prices ranging from $47,950 to $129,900. A 2020 Peterbilt 389 can be priced at $79,950. Multiple 2020 Peterbilt 389 units may also be listed around $95,000 each. A 2019 Peterbilt 389 is listed at $63,999. Inspection is welcome and encouraged. Run it yourself. Review the records yourself. The condition claim stands up because the documentation backs it up.

Do not buy a used Class 8 tractor without inspecting it in person, and verify onboard diagnostics or navigation features where equipped. This one will hold up to that inspection. If you are serious about a one-owner, fleet-maintained Peterbilt 389 with a fresh Cummins ISX inframe at zero miles, this is the unit.

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Call Jay Trevorrow: (973) 886-3020Email inquiry: jay@ironmartonline.comStock #PTC-38916 | IronMart Online Used Heavy Equipment Sales and Marketing | King of Prussia, PA 19406