Where to Buy an Overdrive for your Transmission in Australia (TH400, C4, C6, and more)

Author: Superformance  Date Posted:9 January 2024 

How do you buy an Overdrive in Australia? Why should you have one? Will your transmission fit one?

GearVendors Overdrive Transmission

Why do I need an overdrive?

Picture this, you’re driving down the highway and your engine is sitting at 4000rpm, you know this isn’t the most fuel efficient or healthy for your engine, but you don’t have a choice, do you? Your final drive ratio means your highway driving will lead to premature engine wear and lower fuel efficiency and you can’t do anything about it. But you can. If you had invested in an overdrive system for your transmission, you could have saved between 20-28% in fuel mileage and significantly reduced your engine wear, saving you both time and money.


What does an overdrive do?

An overdrive unit bolts on to your already existing transmission and allows for an electronic toggle to switch between your regular and a separate final drive ratio, so that you can

  • Lower your rpm at higher speeds in higher gears
  • Protect your engine from unnecessary wear (and your wallet!)
  • Save 20-28% in fuel economy

This means an overdrive over time pays for itself. Installation only requires basic wiring, a bolt-on to your specific transmission, and a shortened driveshaft.


GearVendors Overdrive unit bolted on to a TH400 Transmission in Australia

GearVendors Overdrive bolted to a TH400 transmission

What is the best overdrive in Australia in 2024?
Due to its phenomenal engineering, efficiency, and durability, we highly recommend GearVendors Overdrive. It can handle up to 2000hp and the loss in wheel horsepower is less than 1 per 400hp. We exclusively use this overdrive in all of our custom builds that need an under/overdrive. GearVendors is the top of the market in overdrive systems, with the only problem being they are based in the USA, meaning you can’t buy them without an Australian supplier such as Superformance.


What transmissions can use an overdrive?

GearVendors Overdrives are available in bolt-on units for all the most commonly used classic car transmissions and more, with the most popular models being the GM TH400  Overdrive, Ford C4 Overdrive, Ford C6 Overdrive and GM TH350 Overdrive. However, GearVendors have bolt-on units available for over 1500 different transmissions from Ford, Chev, Dodge, GM, Holden, and more.


Why is the GearVendors Overdrive the most popular choice?

Why does it hold 2 world records in drag racing, 4 off-roading titles, several land speed records and used by majority of cars at drag week? Well, due to the high popularity and high production volume of the under/overdrives, GearVendors can sustain a level of engineering far beyond the industry standard for a very reasonable price.

The easy installation also contributes to its popularity, with some simple wiring, a bolt-on installation to your transmission and a shortened driveshaft being all that’s required. It also uses its own fluid to stop cross-contamination with your transmission and requires no cooling whatsoever, regardless of power, which is something you can’t do if you’re just converting horsepower to heat (like some alternative overdrives).

And because of its popularity, there’s an overdrive unit available for over 1500 different Dodge, Ford, Chevrolet (Chevy) and General Motors transmission types and configurations, with the choice of up to 1000hp or over 1000hp units.

So regardless of whether you’ve got a 1800hp drag car or a weekend cruiser, GearVendors Under/Overdrive will save you time and money by reducing your engine wear and significantly increasing your fuel economy.

Everything included in a GearVendors Overdrive kit


Where to find a GearVendors Overdrive for sale in Australia?

As this product is built in the United States, you’ll need an Australian supplier such as Superformance to get one. As well as just supplying them to anywhere in Australia, Superformance can also fully install them in your vehicle, complete with driveshaft shortening and wiring. Simply just Contact Us or call 07 3488 7831 to purchase. Superformance Brisbane is one of Australia’s largest and most established performance automotive superstores and custom vehicle shops, and has been supplying and installing overdrive units to Australian classic cars and enthusiasts for over 25 years.

For a better look at the GearVendors products we can supply, check out their website with the link below:
Gear Vendors Homepage

Buy GearVendors Overdrive Australia

To purchase a GearVendors Under/Overdrive for yourself, Contact Us  or call 07 3488 7831 and we’ll get back to you with an instant quote. Due to the high demand, we only have limited units in stock at a time, so get in quick before our current shipment is sold out!


Comments (1)

Definitely reccomend gear vendors too

9 January 2024
Had a gear vendors overdrive on my th400 for a few years now and has done wonders for me, definitely a good option if youre driving highway with a short final drive

Leave a comment

Comments have to be approved before showing up