Choose the Western Star 57X for OTR driver comfort — its 72" sleeper options exceed the Mack LR Series's 0" maximum. The Western Star 57X offers more peak power (600 hp vs 505 hp), giving it an edge for heavy-haul and mountainous routes.
| Spec | Mack LR Series 2 available · from $337,999 | Western Star 57X 255 available · from $19,500 |
|---|---|---|
| Engine Options | ||
| Engine options | Mack MP7, Mack MP8 | Detroit DD16, Detroit DD13 Gen 5, Detroit DD15 Gen 5 |
| Horsepower range | 325–505 hp | 370–600 hp |
| Peak torque | 1,860 lb-ft | 2,050 lb-ft |
| Weight Ratings | ||
| GVWR (max) | 66,000 lbs | — |
| GCWR | 66,000 lbs | — |
| Transmission Options | ||
| Transmissions | Mack mDRIVE HD 12-speed Automated, Allison 4500 RDS | Detroit DT12 Direct and Overdrive AMT |
| Dimensions | ||
| Wheelbase options | 4 options (157"–214") | 0 options (undefined"–undefined") |
Choose the Western Star 57X for OTR driver comfort — its 72" sleeper options exceed the Mack LR Series's 0" maximum. The Western Star 57X offers more peak power (600 hp vs 505 hp), giving it an edge for heavy-haul and mountainous routes.
Both the Mack LR Series and Western Star 57X 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 Mack LR Series is built by Mack and the Western Star 57X is built by Western Star. Both are Class 8 conventional tractors but differ in powertrain options, cab dimensions, dealer networks, and MSRP.
The Mack LR Series tops out at 505 hp / 1860 lb-ft torque. The Western Star 57X tops out at 600 hp / 2050 lb-ft. GVWR is 66,000 lbs for the Mack LR Series and similar lbs for the Western Star 57X.
TruckRadar has 257 Mack LR Series and Western Star 57X trucks available right now from dealers nationwide. Search by make, model, price, and location at truckradar.ai.
| Sleeper sizes |
| No sleeper |
| 60", 72" |
| Pricing (estimated) |
| Base MSRP range | $190,000–$260,000 | — |