Kenworth · Class 8 on-highway tractor
Kenworth T660PACCAR MX-13 12.9L (standard), Cummins ISX, Cat C15
Built 2007-2017
Engine PACCAR MX-13 12.9L (standard), Cummins ISX, Cat C15
Sources checked 117 of 131 (89%)
What it is
The T660 bridged the gap between the aging T2000 and the newer T680. It carried the aero styling forward with improved lighting, aerodynamics and driver comfort. Over 60,000 were sold in ten years.
Pick a folder
Fluids & Fill Amounts5 entriesBolt Tightness51 entriesWhen to Service12 entriesWarning Lights & Codes30 entriesHow to Fix It77 entries
The truck itself
Engine options
PACCAR MX-13 12.9L (standard from ~2010), Cummins ISX 14.9L, Cat C15 15.2L
Horsepower
455 hp standard (MX-13); 410-500 hp (ISX)
Peak torque
1,650 lb-ft standard (MX-13); 1,550-1,650 lb-ft (ISX)
BBC
113 in
Cab
AeroCab day cab or 38/62/72/86-in sleeper
Transmission
Eaton Fuller 9/10/13/18-speed manual or AutoShift/UltraShift; PACCAR TX-12 from ~2013
Front axle
Dana Spicer 12k-13.3k
Rear axle
Dana Spicer / Meritor 40k-46k tandem
Weight class
Class 8 - 40,000-46,000 lb tandem rear, 12,000-13,300 lb steer
Before you order anything
Options change the numbers
The T660 was introduced in 2007 and discontinued in 2017. Early models (2007-2010) were commonly ordered with the Cummins ISX or Cat C15; later models shifted to the PACCAR MX-13 as standard. 2007+ models carry EGR and DPF.