Peterbilt · Class 8 on-highway tractor
Peterbilt Model 387PACCAR MX-13 12.9L (2010+), Cummins ISX 14.9L, Cat C15 15.2L
Built 2006-2018
Engine PACCAR MX-13 12.9L (2010+), Cummins ISX 14.9L, Cat C15 15.2L
Sources checked 117 of 131 (89%)
What it is
Peterbilt's aerodynamic highway tractor from 2006 to 2018. The 387 was the aero counterpart to the 379, with improved aerodynamics and driver comfort. It was replaced by the 579 in 7+ years of production.
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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 (2010+), Cummins ISX 14.9L, Cat C15 15.2L (2006-2010)
Horsepower
405-510 hp (MX-13); 385-600 hp (ISX)
Peak torque
1,450-1,850 lb-ft (MX-13); 1,450-2,050 lb-ft (ISX)
BBC
120 in
Transmission
Eaton Fuller 9/10/13/18-speed manual or UltraShift; PACCAR TX-12 (2010+)
Front axle
Meritor / Dana 12k-13.3k
Rear axle
Meritor / Dana 40k-46k tandem
Weight class
Class 8 - 40,000-52,000 lb tandem rear, 12,000-13,300 lb steer
Before you order anything
Options change the numbers
The 387 was introduced in 2006 and discontinued in 2018. Early models (2006-2010) carried Cummins ISX or Cat C15; from 2010 the PACCAR MX-13 became the standard. 2007+ models carry EGR and DPF; 2010+ also carry SCR and DEF.