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Kenworth T680 vs Peterbilt 579: Aftermarket Parts Comparison & Compatibility
Kenworth T680 vs Peterbilt 579: The PACCAR Siblings
The Kenworth T680 and Peterbilt 579 are both built by PACCAR and share the same chassis platform. This leads many fleet operators to wonder: can parts be shared between these trucks? The short answer is no for exterior body parts, but understanding the details can save your fleet significant money.
What They Share
Both trucks use the same PACCAR MX-13 engine, Eaton transmissions, and Dana axles. Drivetrain, suspension, and many electrical components are cross-compatible. This means one set of mechanical parts inventory can serve both truck models in a mixed fleet.
What They Don't Share
Every exterior body panel is model-specific. Headlights, bumpers, grilles, mirrors, fenders, and hoods are completely different between the T680 and 579. Even door handles and mirror covers have distinct designs. Never attempt to cross-fit exterior parts between these two models.
Aftermarket Parts Pricing Comparison
Aftermarket pricing is comparable between the two models. T680 headlights run $120-250, while 579 headlights run $100-200. Bumper assemblies are $200-400 for both. Mirror assemblies are similarly priced at $100-180. The T680 tends to have slightly higher parts prices due to its more complex headlight design with integrated LED running lights.
Parts Availability
Both models have excellent aftermarket parts availability. The T680 and 579 are both high-volume sellers, which means aftermarket manufacturers produce parts for both in large quantities. EverTrust stocks parts for both models with same-day shipping availability.
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