Truck Drivetrain Repair for Heavy-Duty Fleets Across Charlotte, Greensboro, Durham & Statesville

Heavy-duty vehicles have heavy-duty drivetrains that must be maintained if they’re to stay in good shape. Drivetrains are the way in which your power moves from your engine to your wheels. Starting with your transmission, your power is optimized. It’s then sent to your differentials using a series of driveshafts. From your differentials, the power is then sent to your wheels using a series of drive axles. From there, your wheels turn, and your heavy-duty truck starts to move. Here at National Fleet Management, we offer a wide array of services that are sure to keep your heavy-duty drivetrain in pristine condition for years to come. 

Common Truck & Trailer Drivetrain Services

Vibration Under Acceleration
Vibration that increases with speed often points to a worn U-joint or an out-of-balance driveshaft. Left unaddressed, the vibration accelerates wear on surrounding components like the transmission and differential.

Clunking Noise on Shifts or Acceleration
A clunk when shifting from park to drive, or when accelerating from a stop, usually indicates excess play in a U-joint or yoke connection.

Fluid Leaks Near the Differential
Fluid pooling near the differential housing points to a failing seal, gasket, or cracked housing. Left unchecked, low fluid levels lead to overheating and premature gear wear.

Whining or Humming from the Rear Axle
A whining or humming noise that changes with vehicle speed often indicates worn differential gears or low/degraded fluid.

Grease or Metal Shavings Around U-Joints
Grease buildup or visible metal shavings near a U-joint usually means the joint is wearing internally and needs replacement before it fails completely.

Trailer Differential & Drivetrain Service

On trailers equipped with liftable or driven axles, differential and drivetrain components wear the same way they do on tractors — through heavy load, road debris, and time. National Fleet Management inspects and services trailer differentials, yokes, and U-joints alongside standard trailer maintenance. [CONFIRM: which trailer types have driven axles vs. standard axles — this section may only apply to a subset of the trailer fleet]

Mobile Truck & Trailer Drivetrain Service

For issues that don't require full shop equipment, NFM's mobile units handle differential fluid checks and changes, and U-joint inspection and replacement, on-site. [CONFIRM: which mobile markets cover drivetrain work]

When to Call for Mobile Drivetrain Service

Routine Fluid Service
Differential fluid changes and inspections are typically handled on-site without a shop visit.

U-Joint Replacement
Standard U-joint replacement is a common field repair that doesn't usually require shop equipment.

Differential housing repair, gear replacement, and work requiring the vehicle to be lifted on a hoist are completed at our full-service locations.

Drivetrain FAQs

How do I quickly confirm driveline phasing after U-joint service?

Align yoke ears so the front and rear yokes share the same plane, then road-test for vibration. If angles were corrected and balance is good, proper phasing will eliminate most speed-dependent shake.

What are common drivetrain issues in diesel fleet vehicles?

Fleet vehicles often show drivetrain symptoms like vibration, clunking, power loss, or uneven tire wear. These signs may point to worn U-joints, transmission problems, or differential wear. Regular inspections help North Carolina fleets avoid costly breakdowns and keep trucks road-ready.

What is included in a driveline inspection for fleet trucks?

A typical driveline inspection includes a review of the transmission, transfer case, driveshafts, differentials, and axle shafts. Technicians look for signs of fluid leaks, worn joints, misalignment, and abnormal wear to ensure the drivetrain is operating safely and efficiently.

What causes excessive wear in a truck’s drivetrain? 

Excessive wear in a heavy-duty diesel truck’s drivetrain is commonly caused by poor lubrication, contaminated or degraded oil, overloading beyond rated capacity, misaligned components, aggressive driving habits, and inadequate maintenance. Worn bearings, damaged gears, and improper torque application also accelerate deterioration and reduce overall drivetrain lifespan significantly.

Serving Fleets Across the Region

Full-service drivetrain repairs in:

• Charlotte, NC
• Greensboro, NC
• Durham, NC
• Statesville, NC

Mobile service also available in:

• La Grange & Kinston, NC
• Carlisle, PA
• Greenville, SC
• Lexington, KY
• Wilmington, NC
• Bowling Green, KY
• Roanoke, VA

Keep Your Drivetrain Running Smoothly

Worn U-joints or low differential fluid today can mean a bigger drivetrain failure tomorrow. Contact us today to schedule drivetrain service, or reach out to your account rep if you're coordinating service across a fleet.