Our Services

In addition to being the go-to team for vehicle owners needing a diff specialist in Melbourne, we also offer a variety of other services. These include:

Explore Our Complete Range of Vehicle Services

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Our Products

Supplying Products All Over Australia and New Zealand Visit Store
G&J Differentials
DIff Repairs Melbourne G&J Differentials is also home to brands V&J Motors, etc ensuring all your vehicle maintenance, repair and spare parts needs are covered.

Don't just take our word for it – listen to what Summernats, the leading car festival in Australia, have to say about us! G&J Differential Services were recently featured in Summernats' magazine, Street Machine, and praised for the high quality of our work and service. If you're looking for a team that truly knows cars, we’re the clear choice!

The Trusted Diff Specialist in Dandenong, Melbourne

Welcome to G&J Differential Services – we’re the diff specialists! Whether you are looking for a diff specialist in Adelaide, Auckland, Brisbane, Melbourne, or Sydney and its surrounding areas, we deliver throughout the Australasian region! Our wide geographical reach speaks to the professionalism of our services and our unbeatable range of products. G&J diffs are a highly sought-after diff specialist, from Adelaide to Auckland, Brisbane to Melbourne, Sydney and surrounding areas. Located in Dandenong, Melbourne, we possess over twenty-years’ industry experience, proudly servicing the needs of domestic and commercial-vehicle drivers alike. If you have any query or need related to diffs, axles or gearboxes, call the diff specialists! We’re happy to help!

Diff Repairs Australia

At G&J Differential Services, we specialise in providing the highest standard of diff repairs and conversions for all vehicle makes and models including front and rear wheel drives, light commercial vehicles and trucks. At G&J Differential Services we are committed to providing our diff repair services to customers from Bentleigh, Clayton, Narre Warren, and beyond. Our superior customer service and reasonable prices firmly places us a leader in our field. When it comes to diff gears, discover just how G & J Differential Services can help you.

We can also deliver a wide range of products to assist mechanics with difficult repairs throughout the country – and New Zealand! If you’re looking for hard-to-source parts for diff repairs in Adelaide, Auckland, Brisbane, Gold Coast, Perth, Sydney and surrounding areas, we can provide you all you need to complete diff repairs and conversions.

We are well known by mechanics across Australia as the diff specialists, from Auckland to Adelaide, Brisbane to Melbourne, Sydney and surrounding areas. No matter how complicated the job, we will have the right part to leave your customer satisfied.

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High Quality Cleaning Services and Affordable Prices

Why Choose Us?

Change over differentials on all makes and models
Change over differentials on all makes and models

We can provide assistance no matter what type of car you own and drive.

Diff repairs and ratio changeovers
Diff repairs and ratio changeovers

Everything from diff repairs through to diff ratio upgrades and changeovers.

9� diff conversions
9" diff conversions

We can supply and fit 9" diff conversions for any vehicle make and model.


We can fit, modify, repair and balance tailshafts for almost any vehicle.

Custom made axles
Custom made axles

With over 20 years of experience, we can provide quality custom made axles.

Centre Bearings
Centre Bearings

We offer centre bearing repair and replacement as well as maintenance.

Explore Our Complete Range of Vehicle Services
  • Change over differentials on all makes and models
  • Diff housing and axle straightening
  • Diff repairs and ratio changeovers
  • High speed diffs for 4x4s, Maintenance and replacement of diff gears
Explore All Services


  • “Today I brought in my FG Falcon, you fitted a new tailshaft. Just a note to say thank you, I was surprised to have it done in such a short time, and for a reasonable price. Your service is very friendly too. The car drives great now. Well done!”

  • “I received the axels and was able to get them in the car and the diff was excellent and trouble free, so thanks for getting them here so quick.”

  • “Needed a team I could count on for all the parts I need for my own auto shop. G&J Diffs delivered, with parts for Holden to Ford!”

    Michael B
Diff Conversions & 9 Inch Diff Conversions - Melbourne

With twenty-years' experience in the business, we’re well known as the experts in diff conversion in Melbourne. We use only the most state-of-the-art technology for all our diff conversions, to ensure a premium service.

Diff Lockers in Melbourne, Brisbane, Perth & other Australian cities

If you’re a mechanic looking to perform 9-inch diff conversions in Brisbane, Perth, Sydney, or any other area in Australasia, we supply all the parts you’ll need to complete an excellent conversion job. Your customer’s customisation is never too hard with our range of products. As experts in diff conversions, Brisbane and Sydney mechanics, as well as mechanics from across the Australasian region, can consult with us for the best part to perform their job.

We have the best quality products to enable diff repairs in Auckland, Adelaide, Brisbane, Gold Coast, Perth, Sydney and surrounding areas, so mechanics can perform conversion jobs they couldn’t have before.

Services we specialise in

In addition to being the go-to team for vehicle owners needing a diff specialist in Melbourne, we also offer a variety of other services. These include:

  • 9-inch diff conversions., Melbourne-wide
  • Mechanical repairs and servicing
  • New and second-hand parts
  • Plus much more!

Click here to read more about the services we provide at our Dandenong workshop.

Limited Slip & Truetrac Differential - Melbourne

Integral for the automatic control of a vehicle’s differential systems, diff lockers provide an increased amount of traction when operating your vehicle. Thanks to our years of outstanding experience the team at G&J Differential Services have installed and repaired outstanding and customised diff lockers across Melbourne from Clayton, Hampton Park, Mordialloc, and Noble Park motorists, promptly and affordably.

Engine Changeover

If you're a mechanic, we can assist you with diff lockers from Brisbane to Perth, or anywhere across the Australasian region. Mechanics the whole country over contact us to assist with diff lockers. Brisbane, Perth, Sydney mechanics – even mechanics in Auckland, have testified to our premium products. We also have truetrac diffs – for those customers looking for an enhanced performance with smooth and quiet operation. Mechanics won't be disappointed with the quality of truetac diffs – call us to ask about them today!

Differential Gear Melbourne

At G&J Differential Services our skilled and trained technicians use the best parts and components to ensure that your vehicle operates at optimal capacity without failure. Our innovative and prompt service allows us to deliver a greater level of vehicle stability and control. Thanks to our dedicated differential gear services Melbourne motorists can trust us to deliver a balanced and unmatched service to our customers.

Ford Diff Conversions

At G&J Differential Services we are passionate about unleashing the true power of your vehicle. By completing detailed and affordable for Ford diff conversions for motorists from Dandenong, Clayton, Endeavour Hills, Moorabbin, Rowville, and beyond we aim ensure that your vehicle’s engine output is successfully translated to control and speed. We also stock truetac diffs!

Engine Changeover Melbourne

In addition to our extensive range of differential replacement, repair, and maintenance services our skilled mechanics and technicians excel at delivering a wide range of other vehicle services – including engine changeover. Drawing on over twenty-years’ experience we have successfully helped countless engine changeovers for customers across Melbourne. Through our utilisation of the best parts and components we can guarantee that by coming to us for your vehicle’s needs, you’ll find your engine changeover keeps your car running well into the future!

Diff Conversions & 9 Inch Diff Conversions from Specialists in Melbourne, Sydney, Brisbane, Perth, Adelaide, Gold Coast, Auckland & other cities

Brands We Serve
  • Mazda
  • Toyota
  • Nissan
  • BMW
  • Audi
  • Ford
  • Holden