Frequently Asked Questions About Kenworth T800 Drivetrain Parts
What year models are your T800 drivetrain parts compatible with?
Our drivetrain parts are designed to fit Kenworth T800 models from 1986 through 2014. However, compatibility can vary based on specific configurations. For transmissions and differentials, we recommend checking your truck's OEM or contacting us with your year, engine type, and current transmission model. Major compatibility breaks occur between pre-2007 and post-2007 models due to emissions equipment changes that affected drivetrain mounting points.
Do I need special tools or professional installation for clutch and transmission components?
Most clutch replacements require a transmission jack, clutch alignment tool, and torque wrench capable of 100+ ft-lbs. While experienced mechanics can complete the job in 6-8 hours, we recommend professional installation for transmissions and differentials due to precise adjustment requirements. Driveshaft u-joints and carrier bearings can typically be replaced with standard shop tools, though a hydraulic press makes the job easier. Always ensure proper driveline angle alignment to prevent premature wear.
What's the difference between OEM and aftermarket drivetrain parts for my T800?
OEM parts like Eaton Fuller transmissions and Meritor differentials match original specifications exactly but cost 20-40% more. Quality aftermarket brands we carry, including Spicer, Roadmaster, and National, meet or exceed OEM specifications and often feature upgraded materials. For high-mileage trucks or severe-duty applications, aftermarket heavy-duty clutches and u-joints can actually outlast OEM parts. The main consideration is warranty coverage - OEM parts typically include 1-2 year warranties while aftermarket ranges from 90 days to 1 year.
How do I identify which transmission or differential I have in my T800?
Look for the identification tag on the transmission case (usually driver's side) showing model numbers like FRO-16210B or RTLO-16913A. For differentials, check the tag on the carrier housing or axle tube. Common T800 configurations include Eaton Fuller 10, 13, and 18-speed transmissions paired with Meritor RT-40-145 or RS-23-161 rear differentials. If tags are missing or illegible, count the shift positions or provide us with your OEM and we can reference build records to determine the correct parts.
What are the signs I need to replace drivetrain components, and which parts wear out first?
U-joints typically need replacement every 100,000-150,000 miles and show signs like squeaking, clunking, or visible rust. Clutches last 250,000-400,000 miles depending on application - watch for slipping, hard shifting, or burning smells. Transmission synchronizers wear gradually, causing grinding when shifting. Differential issues present as whining noises, especially on deceleration. Carrier bearings create rumbling vibrations at highway speeds. Address u-joints and carrier bearings immediately as failure can damage driveshafts or differentials, leading to costly repairs.
