
Dimensions
Configuration |
Standard |
Optional |
Drive |
4×2, 6×4 |
4×4, 6×6 |
BBC |
123″ |
123″ |
BA |
50″ |
50″ |
Wheelbase |
Up to 448″ |
Up to 448″ |
Frame |
Single-channel @ 2.5 million RBM |
Double-channel @ 3.2 million RBM and 4.5 million RBM / Triple-channel @ 5.6 million RBM / Partial frame liners available for increased RBM in specific areas. See dealer for details. |

Western Star 4900 SB Cab
Configuration |
Standard |
Optional |
Cab Type |
Standard with roped in windshield |
Severe Duty with bonded windshield / Severe Duty with two-piece bonded windshield |
Cab Interior |
Obsidian Black Trim with Grey Upholstery |
Grey Trim with Maple Leaf Red Upholstery / Grey Trim with Smoky Mountain Gray Upholstery / Tan Trim with Prairie Buckskin Upholstery |
Hood |
Fiberglass Traditional Non-Sloping Hood |
Supervisibility Fiberglass hood |
Engine Details
Configuration |
Standard |
Optional |
Number Of Cylinders |
6 |
6 |
Engine Make |
Detroit Diesel |
Detroit Diesel / Cummins |
Engine Model |
Detroit DD15 |
Detroit DD13 / Detroit DD16 / Cummins ISX15 |
Displacement |
14.8L |
12.8L / 15.6L / 15.0L |
Power |
400-505 hp |
350-505 hp / 500-600 hp / 400-600 hp |
Power Measured @ |
1800 rpm |
1625 rpm / 1800 rpm / 1900 rpm |
Peak Torque |
1550-1750 lb-ft |
1250-1850 lb-ft / 1850-2050 lb-ft / 1450-2050 lb-ft |
Torque Measured @ |
1100 rpm |
975 rpm / 975 rpm / 1200 rpm |
Aspiration |
Turbocharged |
Turbocharged |

Transmission
Configuration |
Standard |
Optional |
Drive |
4×2, 6×4 |
4×4, 6×6 |
Transmission |
Eaton Fuller FR-13210B (7, 10, 11, 13, 15 and 18-speed) |
Eaton Fuller UltraShift PLUS / Allison Automatic 4000, 4500, 4700 |
Front Axle |
Detroit single 12,000-20,000 lb |
Hendrickson single 12,500 lb / Meritor single 12,000-23,000 lb / Meritor tandem @ 40,000 lb (Set Back Axle only) |
Rear Axle |
Detroit tandem 40,000-46,000 lb |
Meritor single 23,000 lb / Meritor tandem 40,000-70,000 lb / Meritor tridem 69,000-77,000 lb / Sisu tandem 70,000 lb / Sisu tridem 105,600 lb |
Front Suspension |
Taperleaf 12,000-20,000 lb |
Flatleaf 14,600-23,000 lb |
Rear Suspension |
AirLiner 23,000-69,000 lb |
Hendrickson 40,000-65,000 lb / Chalmers 46,000-52,000 lb / Neway 46,000-78,000 lb / Reyco 23,000 lb / TufTrac 40,000-52,000 lb |
Brakes |
WABCO 4S/4M and 6S/6M Anti-lock Braking System (ABS) with and without traction enhancement |
|

Service Refill Capacities
Configuration |
Standart |
Optional |
Fuel Tank Capacity |
60-150 gal (227-567 L) |
50-150 gal (189-567 L) |
Fuel Tank Type |
Aluminum 25″ cylindrical tank – RH or LH |
Aluminum 23″ cylindrical – RH or LH / Combination fuel/hydraulic tanks |
DEF Tank Capacity |
6, 13, 23 gal (23, 49, 87 L) |
6, 13, 23 gal (23, 49, 87 L) |

Telematics fleet-managment solutions from Zonar Systems – Ground Traffic Control® (GTC) web-based fleet tracking application and the 2020® android communications tablet.

Ground Traffic Control and 2020 tablet can be integrated with the connectivity platform installed on all Western Star trucks built with a Detroit Diesel engine.