Kenworth T660 Financing

The T660 was Kenworth's purpose-built fuel economy answer for long-haul lanes, and it delivered. Aerodynamic fairings, roof deflectors, side extenders, and a cab profile tuned in the wind tunnel made the T660 one of the most fuel-efficient Class 8 tractors available when it was in production. Kenworth built the T660 from 2008 until 2014, when it was replaced by the T680, and the used market still carries a healthy supply of these trucks for operators who want proven aerodynamic performance without the new-iron price tag.

We finance T660 units on the secondary market regularly. The trucks hold their structure well, the PACCAR MX-13 or Cummins ISX engines that powered most of them have strong rebuild histories, and the cost-per-mile math on a well-maintained unit at a used price is hard to argue with for a solo operator or a small fleet building out.

Whether you are grabbing a single T660 to replace an aging daycab or buying three or four at once to fill out a team-driver operation, we can structure the financing. Minimum transaction is $50,000, and most T660 deals running about $80k to $130k run application-only with a quick credit decision. Check out our broader Equipment Options page if you are also considering newer models alongside a T660 purchase.

The T660 Under the Hood and on the Road

Kenworth introduced the T660 at a point when diesel prices were making fuel economy a first-tier specification decision for fleet managers. The truck used a low-profile cab with an integrated sleeper, sloped hood, and aerodynamic cab extenders designed to reduce drag compared to the boxy conventional designs that still dominated the market. The result was a coefficient of drag that tested notably lower than the trucks it competed against at the time.

Engine options included the PACCAR MX-13, which displaced 12.9 liters and produced between 380 and 510 horsepower in various configurations, and the Cummins ISX at comparable outputs. Transmissions were typically 10-speed Eaton Fuller manuals or the Eaton UltraShift Plus automated manual. The automated option became increasingly common in later production years as fleet operators pushed for easier driver onboarding.

The T660 came primarily as a mid-roof or high-roof 70-inch sleeper, although day cab configurations exist in smaller numbers. High-roof units with the 70-inch flat-roof sleeper are the most common on the used market and command a premium because they are the ones long-haul drivers actually prefer. Interior layout is functional but not as spacious as some competitors of the era, which some drivers appreciate for the lower center of gravity it provides in mountain terrain.

By the time these trucks hit 600,000 to 700,000 miles, they are often into a first or second engine inframe rebuild. A properly rebuilt MX-13 or ISX can run another 500,000 miles without issue. Buyers should verify the rebuild history and look at oil analysis records if available. Lenders on used trucks at this mileage range will typically want a down payment of 15 to 25 percent to cover depreciation risk.

The T660 competes in the same category as the Financing Options for used aerodynamic highway tractor purchases, and operators often cross-shop both. The Kenworth tends to draw loyalty from drivers who prefer its ride and visibility, while the Cascadia has wider availability on the used market. We finance both.

Where T660 Trucks Work Best

The T660's design was optimized for interstate miles at highway speed. Its aerodynamic package pays dividends most strongly on OTR runs of 500 miles or more per day where the truck is cruising steadily and the drag reduction translates directly to fuel savings. Short-haul or regional work with lots of stops and starts does not let the aerodynamics earn as much, though the truck still functions well in those applications.

Flatbed and specialized operators tend to avoid the T660 because the aerodynamic side extenders complicate tarping on open loads and some of the fairings can be damaged by chains or edge protectors that shift during transit. The T660 is fundamentally a dry van and reefer truck. If you are running Get Fleet Terms lanes with temperature-controlled or boxed freight, it fits. If you are running flatbed heavy haul, you probably want a different spec.

Team driver operations appreciate the T660 because it burns less fuel per mile than older conventional designs, and over a week of team miles that adds up to real money. The sleeper is adequate for two-driver teams running 600 to 700 miles per day with split rest, though drivers who prefer more living space tend to gravitate toward wider or taller sleeper configurations from other models.

Carriers running lanes in and out of major distribution hubs near Chicago or along the I-10 and I-20 corridors frequently use T660 units because the fuel economy over long interstate stretches justifies the spec. If your freight is consistent and your lanes are predictable, the T660's operating cost advantage is real and measurable.