The new, proprietary Aerodynamic Package for Peterbilt Model 386 and 384 trucks was designed through computer analysis and testing to reduce vehicle drag by up to 24%, the company says. That’s said to translate into a 12% fuel-economy gain over the same Peterbilt truck without the aerodynamic improvements.  Benefits were validated by the company with computational fluid dynamics studies, wind-tunnel testing, and on-track drag metering pulling 53-ft van trailers. Depending on the price of fuel and distance covered, the potential annual saving is easily several thousand dollars.

The package includes: a new roof fairing with trim tabs that help push air up and over the cab and trailer to reduce drag; a new sleeper roof transition that brings smoother air flow between the cab and sleeper roof lines; enhanced chassis fairings that have been re-contoured at the end to feature a ‘flare’ design element which redirects air flow around the rear tires and wheels; optimized aero battery box/toolbox to provide better air flow under the cab; a composite sun visor that minimizes aerodynamic drag while enhancing glare protection; a new sleeper extender that features a 3-in. rubber extender flare to redirect air flow outward and around the trailer; and new lightweight aerodynamic mirrors that include 4-way adjustability both vertically and horizontally, with an integral convex mirror and fully heated primary and convex sections.

Peterbilt’s new Aerodynamic Package will be available for order on new Models 386 and 384 and is also available from PACCAR Parts for retrofit on these trucks.

The classic Models 388 and 389 also get a new Fuel Efficiency Package not unlike the 384/386 kit, and this too is said to offer a 24% aerodynamic gain and 12% better fuel economy. As well, it’s available in retrofit form, including a kit for earlier Models 378 and 379.

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