Western Star 4900: History, Variants, Engines and Specs

From Kelowna to Portland: Western Star's History

Western Star began in 1967, when White Motor Corporation set up the White Western Star division with a new plant in Kelowna, British Columbia. Trucknews describes the early trucks as essentially hand-built and aimed first at the forestry market, where they became logging trucks before moving into the oil patch and mines.

Ownership changed hands several times. When White's truck business went to Volvo in 1981, Western Star was left out and sold to Bow Valley Resources and Nova Corporation. Terry Peabody, who owned the Australian Western Star operation, bought a controlling stake around 1990 (sources give 1990 or 1991). In 2000 DaimlerChrysler bought Western Star and folded it into its Freightliner division, and in 2002 the Kelowna plant closed and production moved to Portland, Oregon. In the mid-2010s Daimler added Western Star production at its plant in Cleveland, North Carolina, starting with the 4700 in 2014; Wikipedia says 4900 builds there followed in 2015.

When the 4900 Arrived

Dating the 4900 depends on what counts as the 4900. Fleet Equipment calls it Western Star's first production vehicle, introduced in 1967 for severe service in logging and mining. Diesel Laptops, a repair-data publisher, dates the 4900 series as most owners know it to 1990.

The cab is easier to pin down. In early 1996 Western Star launched what Commercial Motor called the first all-new truck in its 30-year history, the Constellation Series, which was bigger and more comfortable than the older bonneted trucks, renamed the Heritage Series. The same report says the cab design began a few years earlier as a joint project between DAF and Western Star of Australia, before the Kelowna team finished its development. Trucknews says the 4900 carries that cab on the Cornerstone chassis introduced in 1988.

The 4900 Variants: EX, FA, SA, SB, SF, XD

The letters after 4900 describe the layout. Diesel Laptops lists SF (set-forward axle), SB (set-back axle), TS (twin steer), XD (extreme duty) and EX (extended hood). Fleet Equipment uses FA (set-forward front axle) and SA (set-back front axle) for the same ideas, plus EX and a Low-Max version it describes as basically an EX with a lower ride height. A 2008 Trucknews road test drove a 4900 FA, so both naming schemes show up in period paperwork.

Before 2002, Diesel Laptops says, the trucks carried names like 4964EX, 4964F (later 4900SF) and 4964S (later 4900SB), with the 64 meaning a 6x4 axle setup. It also notes that VIN decoders cannot pin down the exact 4900 model for 2002 and older trucks.

Hood length separates the EX from the rest. Diesel Laptops gives the SF, SB and XD a 123-inch bumper-to-back-of-cab measurement and the EX 132 inches. A spec sheet republished by a towing-equipment dealer lists a fiberglass non-sloping hood for the SF, SB and EX, a set-back version with a supervisibility hood, and a three-piece butterfly hood on the XD.

The XD is the heaviest of the family. Launch coverage of the XD-25 package in 2017 reported a 22,000-pound front axle and a 70,000-pound rear tandem, aimed at construction and off-road hauling.

Engines and Drivetrain

Engine choices changed with each emissions era. A fan-maintained reference says buyers could pick engines from Cummins, Caterpillar, Detroit Diesel and Mercedes, and dealer listings show 1996 trucks running Caterpillar power. The 2008 Trucknews test truck had a 14-liter Detroit Diesel rated 470 to 515 hp, with 1,650 lb-ft of torque at 1,200 rpm, and a 13-speed Eaton Fuller. The dealer in that story said the 18-speed was by far the most popular choice.

Late 4900 spec sheets list the Detroit DD15 (14.8 liters, 455 to 505 hp), the DD16 (15.6 liters, 500 to 600 hp) and the Cummins X15 (450 to 605 hp). Transmissions on the same sheet run from Eaton Fuller 10- to 18-speed manuals to the UltraShift PLUS and Allison 4000-series automatics. Axle options reach from 12,000-pound front axles up to Sisu tridems rated at 105,600 pounds, which explains why the truck shows up under so many oversize loads.

Logging, Heavy Haul and the 49X

That axle menu is the point of the 4900. The 2008 Trucknews test called the truck well suited to mining, logging and construction and noted that twin steering axles were available, and late spec sheets list a tandem front axle or a driven front axle as set-back-only options.

In 2020 Western Star announced the 49X, a clean-sheet vocational truck with a larger windshield and a build about 350 pounds lighter than a comparably spec'd 4900. CCJ reported at the time that the 4900 would stay in production alongside it, and FreightWaves called the 49X an alternative rather than a replacement.

How to Identify a Western Star 4900

Start with the hood. A 4900 has a squared, non-sloping long hood with a tall rectangular grille, and the EX stretches it to 132 inches. A set-back front axle sits well behind the bumper, while a set-forward axle sits closer to the front. A three-piece butterfly hood points to an XD.

Then read the paperwork. Model names such as 4964EX on older titles are the same family, and because VIN decoding is unreliable on pre-2003 trucks, a Western Star dealer with the build data is the safest way to confirm which 4900 a truck really is.