Frequently Asked Questions About Western Star 5700XE Truck Drivetrain Parts

What drivetrain components are compatible with my specific Western Star 5700XE model year?

Western Star 5700XE trucks from 2015-2024 share many drivetrain components, but there are key differences. Models from 2015-2018 typically use Eaton Fuller manual transmissions (13 and 18-speed), while 2019+ models may have the Detroit DT12 automated option. Always verify compatibility using your VIN number or truck's build sheet. Driveshafts, U-joints, and carrier bearings are generally consistent across model years, but transmission-specific parts like clutch kits and shift towers vary by transmission type.

How difficult is it to install drivetrain parts on a 5700XE, and what special tools are required?

Most drivetrain installations require intermediate to advanced mechanical skills. Basic components like U-joints and carrier bearings need standard shop tools plus a press or U-joint tool. Clutch replacements require transmission removal, which needs a transmission jack and alignment tools. Differential work requires specialized tools like bearing pullers and dial indicators. Many owner-operators handle U-joints and driveshaft work themselves, but transmission and differential repairs typically require professional installation to maintain warranties and ensure proper operation.

What are the most common drivetrain failure points on the Western Star 5700XE?

Based on driver feedback, the most frequent issues are U-joint wear (typically every 150,000-200,000 miles), clutch wear on manual transmissions (250,000-400,000 miles depending on application), and carrier bearing failure (200,000-300,000 miles). The Eaton Fuller transmissions are notably reliable, but synchros can wear with aggressive shifting. DT12 automated transmissions may experience actuator issues around 300,000 miles. Regular greasing of U-joints and driveshaft components significantly extends component life.

What's the difference between OEM and aftermarket drivetrain parts for the 5700XE?

OEM parts from Meritor, Dana, and Eaton guarantee exact fit and typically last longer but cost 20-40% more than aftermarket options. Quality aftermarket brands like Spicer, Neapco, and SKF offer comparable performance at lower prices. For critical components like ring and pinion sets or transmission internals, OEM is recommended. For wear items like U-joints, carrier bearings, and clutch kits, reputable aftermarket parts provide excellent value. Avoid no-name imports for drivetrain components as failure can cause extensive damage.

How do I identify which rear differential ratio my Western Star 5700XE has?

Your differential ratio is stamped on a metal tag on the differential housing, typically on the driver's side. Common ratios for the 5700XE range from 2.64:1 to 4.30:1, with 3.42:1 and 3.73:1 being most popular for highway applications. You can also find this information on your door jamb sticker under "Axle" or in your build sheet. The ratio affects parts selection for ring and pinion sets, and changing ratios requires reprogramming the ECM to maintain accurate speedometer readings and optimize fuel economy.