Choose the Western Star 4900 for OTR driver comfort — its 82" sleeper options exceed the Peterbilt 579's 80" maximum. The Western Star 4900 offers more peak power (600 hp vs 510 hp), giving it an edge for heavy-haul and mountainous routes.
| Spec | Peterbilt 579 1489 available · from $19,999 | Western Star 4900 41 available · from $19,500 |
|---|---|---|
| Engine Options | ||
| Engine options | PACCAR MX-13, PACCAR MX-11 | Detroit DD16, Cummins ISX15, Detroit DD13, Detroit DD15, Detroit Series 60 Tier III |
| Horsepower range | 355–510 hp | 350–600 hp |
| Peak torque | 1,850 lb-ft | 2,050 lb-ft |
| Weight Ratings | ||
| GVWR (max) | — | — |
| GCWR | — | — |
| Transmission Options | ||
| Transmissions | PACCAR 12-Speed Automated Transmission | — |
| Dimensions | ||
| Wheelbase options | 0 options (undefined"–undefined") | 1 options (448"–448") |
| Sleeper sizes | ||
Choose the Western Star 4900 for OTR driver comfort — its 82" sleeper options exceed the Peterbilt 579's 80" maximum. The Western Star 4900 offers more peak power (600 hp vs 510 hp), giving it an edge for heavy-haul and mountainous routes.
Both the Peterbilt 579 and Western Star 4900 hold strong resale value among owner-operators and fleets. Resale depends heavily on mileage, maintenance history, and regional demand — not OEM brand alone. Check current listings on TruckRadar for real-world asking prices.
No. The Peterbilt 579 is built by Peterbilt and the Western Star 4900 is built by Western Star. Both are Class 8 conventional tractors but differ in powertrain options, cab dimensions, dealer networks, and MSRP.
The Peterbilt 579 tops out at 510 hp / 1850 lb-ft torque. The Western Star 4900 tops out at 600 hp / 2050 lb-ft. GVWR is similar lbs for the Peterbilt 579 and similar lbs for the Western Star 4900.
TruckRadar has 1,530 Peterbilt 579 and Western Star 4900 trucks available right now from dealers nationwide. Search by make, model, price, and location at truckradar.ai.
| 80" |
| 34", 40", 54", 68", 82" |
| Pricing (estimated) |
| Base MSRP range | $135,000–$185,000 | — |