Heavy Vehicle Gearbox and Differential Rebuild Services

The gearbox and differential are two of the most critical components in any heavy vehicle. They handle enormous loads, transfer power from the engine to the wheels, and play a vital role in performance, fuel efficiency, and safety. Over time, wear and tear are unavoidable. When these systems begin to fail, repairs are not always enough that is when a full rebuild becomes the best solution.

At A & D Motors, we offer professional gearbox and diff rebuild services for trucks, trailers, buses, and other commercial and heavy-duty vehicles. With years of experience, expert technicians, and a fully equipped workshop, we deliver reliable, high-quality rebuilds that restore your vehicle’s performance and extend its lifespan.

Why Gearbox and Differential Rebuilds Matter

Unlike simple repairs or replacements of individual components, a rebuild involves fully disassembling, cleaning, inspecting, and reassembling the entire unit. This allows us to restore your gearbox or differential to optimal condition, using new or reconditioned parts where necessary.

Some benefits of a proper rebuild include:

• Improved vehicle performance

• Restored fuel efficiency

• Extended service life of components

• Reduced noise and vibration

• Better load handling and gear changes

• Prevention of future breakdowns

• Cost savings compared to full replacements

A rebuild can often be a more cost-effective and long-lasting solution than constant minor repairs or full unit replacements.

Signs You May Need a Gearbox or Diff Rebuild

Understanding when your gearbox or differential needs attention is crucial. Here are some of the most common warning signs:

Gearbox Symptoms:

• Difficulty shifting gears

• Grinding or crunching noises when changing gears

• Gears slipping or not engaging properly

• Delayed response when accelerating

• Leaking transmission fluid

• Burning smell during operation

• Unusual vibrations or noises under load

Differential Symptoms:

• Whining or howling noise when accelerating or decelerating

• Excessive play or knocking from the rear or front end

• Oil leaks near the differential housing

• Unusual tyre wear

• Vibration when turning or under torque

If your vehicle is showing any of these signs, contact A & D Motors for a full inspection. Acting early can prevent more serious damage and reduce your repair costs.

Our Gearbox Rebuild Services

At A & D Motors, we specialise in complete gearbox rebuilds for both manual and automatic transmissions. Our process includes:

1. Complete Disassembly

We remove the gearbox from the vehicle and fully dismantle it to inspect every internal component.

2. Thorough Cleaning

Each part is cleaned using industrial-grade equipment to remove debris, sludge, and contamination.

3. Component Inspection

We carefully inspect gears, shafts, bearings, synchros, seals, and other moving parts for wear or damage. Anything out of spec is replaced.

4. Replacement of Worn Parts

Using quality parts that meet or exceed original manufacturer specifications, we replace all damaged or worn components.

5. Reassembly and Calibration

The gearbox is reassembled with precision, ensuring correct clearances, torque settings, and alignment.

6. Testing and Quality Control

Every rebuilt gearbox is tested to ensure it shifts smoothly, runs quietly, and performs like new.

We work with all makes and models of trucks and heavy vehicles. Whether you drive a European, American, or Japanese brand, our technicians have the experience and tools to do the job right.

Our Differential Rebuild Services

Differentials play a crucial role in transferring torque to the wheels while allowing them to rotate at different speeds. A damaged diff can affect handling, tyre wear, and even cause a breakdown if left unchecked.

Our differential rebuild service includes:

• Removal and inspection of the unit

• Cleaning of all internal and external components

• Checking gear teeth for wear or damage

• Replacement of bearings, seals, and worn parts

• Setup and adjustment of backlash and gear contact patterns

• Reassembly and oil filling

• Bench testing or road testing as required

We work on single, tandem, and tri axle setups, as well as limited slip and locking differentials.

Quality Parts and Precision Workmanship

At A & D Motors, we understand that the quality of the parts we use and the care we put into every job make all the difference. That is why we only use trusted brands and OEM-quality components when rebuilding gearboxes and differentials.

Our technicians follow precise procedures for measuring tolerances, setting preload, and aligning gear sets to ensure every rebuild meets manufacturer standards or better.

We do not cut corners — we do it properly the first time, so you get reliable performance and long-term value from your rebuild.

Workshop and Mobile Services

Most gearbox and diff rebuilds are performed in our fully equipped workshop, where we have access to the tools, hoists, parts, and machinery needed to complete each job to the highest standard.

However, if your vehicle has broken down or cannot be driven, A & D Motors also offers mobile breakdown services. We can assess the situation on site and, if required, arrange safe transport back to our workshop for the rebuild.

We also provide ongoing servicing and follow-up inspections to ensure everything continues to perform as expected.

Serving All Heavy Vehicle Industries

We provide gearbox and diff rebuild services to clients across a wide range of sectors, including:

• Road transport and logistics

• Construction and mining

• Agricultural and rural operations

• Waste management and council fleets

• Refrigerated and general freight

• Earthmoving and plant equipment

No matter what kind of vehicle you operate, if it has a gearbox or differential that needs rebuilding, we can help.

Why Choose A & D Motors

With years of experience and a strong reputation for reliability, A & D Motors is trusted by truck owners and fleet managers across the region. Here is why our customers keep coming back:

• Fully qualified and experienced technicians

• Honest advice and transparent quotes

• Fast turnaround and quality results

• Competitive pricing

• Trusted by fleet operators and independent drivers alike

• Backed by workmanship guarantees and follow-up support

We treat your vehicle with the same care we would give our own. Our goal is not just to fix the issue but to restore performance and help prevent future problems.

Book Your Gearbox or Differential Rebuild Today

If your vehicle is experiencing gearbox or differential issues, do not wait for a complete failure. Contact the experts at A & D Motors and schedule an inspection. We will give you an honest assessment, a detailed quote, and professional service from start to finish.

📞 Call Now: 02 9625 0374 or 0404 067 773
📧 Email: service@aanddmotors.com.au
📍 Visit Our Workshop: Unit 10 / 2-4 Stout Road Mount Druitt NSW 2770

A & D Motors – Expert Gearbox and Diff Rebuilds for Heavy Vehicles