Kenworth T660

KenworthClass 8

Kenworth T660

The aero workhorse that bridged the T600 and the T680 era.

The T660 replaced the T600 for EPA 2007 emissions, adding multiplexed wiring and onboard diagnostics while keeping the fuel-saving aerodynamic profile, before being succeeded by the T680.

Maker

PACCAR

Years

2008–2017

Body

Sleeper

Rating

Up to 80,000 lb GCWR

Power

Up to 600 hp

Applications

Long-haul, Regional

Engines

PACCAR MX-13Cummins ISX15Caterpillar C15

Trouble with your T660?

Describe the symptom and Mike — the free AI truck consultant — will help you figure out what's wrong, which part is involved, and whether it's safe to drive. Free, no account.

Common replacement parts

Real products from the PartsNow catalog. Confirm fitment with Mike before ordering.

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

3030HNTRX

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

OTR10143

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

5-808330 - BRAKE KIT FOR 4709DEN SHOES

5-808330

5-808330 - BRAKE KIT FOR 4709DEN SHOES

370036A - OIL BATH SEAL

370036A

370036A - OIL BATH SEAL

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

348-4195

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

5008414PGBXW

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

11444 - GLADHAND BRACKET MOUNT

11444

11444 - GLADHAND BRACKET MOUNT

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

15W40 OIL

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

Brakes & Wheel End Air System Filtration Electrical & Lighting Suspension & Steering Cooling System Drivetrain Body & Cab Exhaust

Find parts at PartsNow.ai Call or text (865) 290-5485

Guides from the shop

Air Dryer Not Purging? Diagnose Wet Tanks Fast

Air dryer not purging? Diagnose wet tanks fast with checks for governor, purge valve, heater, and cartridge on trucks like Kenworth T800.

Suspension & Steering

Kingpin & Bushing Wear: Steer Axle Play Diagnosis Guide

Learn the dial indicator method to check kingpin and bushing wear on your steer axle before DOT pulls you out of service.

Electrical & Lighting

Trailer ABS Light Won't Go Off? Sensor & Wiring Guide

Trailer ABS light staying on? Step-by-step diagnosis for wheel speed sensors, harness corrosion, and ECU faults before you swap parts.

More Kenworth models

T680

Kenworth's aero flagship and fuel-economy leader.

W990

The classic long hood, reborn for a new era.

W900

A six-decade legend. The long-nose icon.

T880

The vocational do-it-all for the toughest jobs.

T800

The legendary do-anything workhorse.

T380 / T480

Medium-heavy versatility with Kenworth toughness.

K270 / K370

Tight-turning cabover for the city.

C500

The off-road monster of the Kenworth lineup.

T180 / T280

Wide-cab comfort and non-CDL capability for the medium-duty work day.

T680E

Kenworth's flagship aero tractor, reimagined with zero tailpipe emissions.

K270E / K370E

Quiet, emission-free cabovers built for the city delivery loop.

T680 FCEV

Hydrogen power with the range and refuel speed diesel drivers expect.

T600

The aerodynamic revolution that taught the whole industry to cheat the wind.

T2000

Kenworth's clean-sheet fleet truck and the first all-new design in decades.

T700

The short-lived aero tractor that handed the torch to the T680.

T270 / T370

The versatile medium-duty conventional that did a little of everything.

T440 / T470

Heavy Class 7 muscle that bridged medium-duty and vocational work.

K100

The cabover legend that defined the flat-nose era of American trucking.