As an owner-operator, every mile counts and so does every part under your Peterbilt 379. That's why we offer high-quality aftermarket drivetrain replacement parts built to deliver reliable performance, reduce downtime, and help protect your investment. Whether you're replacing a worn u-joint kit, upgrading a camshaft, or fixing a faulty DPF differential pressure sensor, our heavy-duty truck parts are designed to get you back on the road fast and keep you there. If you're looking to secure the performance of your truck, consider other, closely-related components that see a lot of wear-and-tear from engine heat on the road; these include Pete 379 engine cooling components or durable aftermarket brake parts and accessories.

Get the Most Out of Your Peterbilt 379 Drivetrain

The drivetrain is what takes the power from the engine and brings it to the wheels via the transmission, driveshaft, differential, and axle parts. Each components is critical to long-hauling endeavor. The differential allows for safer, controlled turning. The axles support your cargo weight. Your clutch prevents jerky movements by allowing for smooth gear changes. When any one of those parts wears out, it affects your whole operation impacting your fuel economy and even your load-handling and ride quality. That's why we carry a wide assortment of aftermarket replacement pieces from input shafts, rear output shafts, and locking nuts, to lift axle control panels, bearing strap kits, and differential oil seals. Regardless of the brand that you're running with, you ll find the right replacement parts you need, each one ready to view, add to cart, and ship to your specified location.

Why Choose Our Aftermarket Drivetrain Parts?

- Competitive Pricing: Our parts are competitively priced often more affordable than OEM, without sacrificing quality. - Heavy-Duty Construction: Built for commercial use, every product in our catalog is made to stand up to the job. - Fast Availability: Many items are in stock, rebuilt, non-wrecked, or pulled from quality cores and ready for immediate sale. - Extended Value: Keep your Peterbilt 379 on the road longer, boost resale value, and protect your bottom line. - Wide Compatibility: These semi truck transmission parts fit the 379 and other makes like Mack, International, Volvo, and more. We know you're not just fixing a truck you're running a business. Our Peterbilt drivetrain replacement parts are engineered for minimal downtime, easy installation, and maximum functionality. Whether you're in Orlando, out west, or anywhere in between, we make it simple to find the right part and contact our expert team for help if needed. If you need a freight quote, our customer service team is ready to support your next repair or upgrade. Keep Your Peterbilt Truck Driving Like It Should. From pto setups to differential components, these parts ensure your drivetrain does what it's supposed to move your truck, shift smoothly, pull strong, and last time after time. Don t wait until something breaks. Upgrade now and drive with confidence. Browse our Peterbilt 379 drivetrain replacement components or type in the specific part number in the search bar. It's easy to sort, compare, and choose the right part for your big rig. Every part you see on this page is backed by performance, durability, and real-world reliability. Your truck is your livelihood. Let's keep it rolling.

Frequently Asked Questions About Peterbilt 379 Drivetrain Parts

What years of Peterbilt 379 are compatible with your drivetrain parts?

Our drivetrain parts are designed to fit Peterbilt 379 models from 1987 through 2007. However, compatibility can vary depending on your specific engine and transmission configuration. For example, parts for Cat 3406E engines differ from those for Cummins N14 or ISX setups. We recommend checking your VIN or calling our tech support at (417) 624-1010 with your truck's specifications to ensure proper fitment.

How difficult is it to replace U-joints and carrier bearings on a 379?

Replacing U-joints typically requires 2-4 hours for an experienced mechanic and basic hand tools including a U-joint press or large vise. Carrier bearing replacement is more involved, requiring the driveshaft to be removed and often needing a hydraulic press. Many customers report that having the correct measurements beforehand saves significant time. We provide detailed specs for all our parts, and alignment must be checked after installation to prevent vibration issues.

What's the difference between standard and heavy-duty driveshaft components?

Standard components are rated for typical highway applications up to 80,000 lbs GVW, while heavy-duty options are engineered for vocational use, heavy hauling, or trucks exceeding 80,000 lbs. Heavy-duty U-joints feature thicker cross sections and upgraded needle bearings, while HD carrier bearings use sealed designs with higher load ratings. If you're running oversize loads or in severe service conditions, the heavy-duty upgrade typically doubles component life.

Do you carry parts for both manual and automatic transmission setups?

Yes, we stock drivetrain components for all factory transmission options including Eaton Fuller 13 and 18-speeds, as well as Allison automatic applications. The main differences are in yoke styles and driveshaft lengths. Manual transmission trucks typically use different slip yoke designs than automatics. When ordering, you'll need to know your transmission model number, which is stamped on the transmission tag.

What causes driveline vibration and which parts should I check first?

Driveline vibration in 379s commonly stems from worn U-joints, failing carrier bearings, or improper driveshaft angle. Start by checking U-joint play - any movement indicates replacement is needed. Carrier bearings often show wear through rubber deterioration or bearing noise. We recommend replacing U-joints in pairs and checking driveshaft balance if vibration persists after component replacement. Proper torque specs and alignment angles are critical for vibration-free operation.