Shifting Gears Automotive logo - performance
Gearbox, transmission and automotive repair specialists
112d Ellis Street, Frankton, Hamilton

Make sure your drivetrain can handle the power

More power only works if the transmission, gearbox and differential can handle it.
Shifting Gears Automotive builds performance drivetrains around the vehicle’s power, weight, gearing and intended use, whether it is a street car, classic, track vehicle or towing setup.
Gary brings more than 20 years of hands-on transmission and gearbox experience to every build.
To discuss your vehicle, contact Shifting Gears Automotive.

Performance Transmission & Drive Train Upgrades - Overview:

Performance transmission and drivetrain upgrades built around power, gearing and intended use.
  • Performance automatic transmission upgrades
  • Purpose-built torque converters and cooling
  • Manual gearbox and clutch upgrades
  • Differential, LSD and Truetrac upgrades
  • Gear ratio changes for performance or cruising
  • Classic, modified, track and towing builds
"I had a autotransmission problem with my car and Gary was a life saver. He is honest, reliable and resourceful. I highly recommend Shifting Gears in Hamilton. The best mechanical service I have had in Hamilton."
Melanie Glover
"Could not recommend Shifting Gears Automotive enough. After multiple workshops couldn’t properly diagnose the issue with my transmission, Gary and the friendly team sorted it quickly and actually knew what they were talking about. You can tell these guys specialise in gearboxes and driveline repairs, not just general mechanical work. Communication was great, pricing was upfront, and my car drives better than it has in years.

Hard to find honest transmission specialists in Hamilton these days but these guys are the real deal. Thanks again team!"
Katie Rowe
"Took my car to shifting gears for transmission/engine service and brakes. Communication was great and overall service was fantastic. Thank you!"
Leanne Jones

Ready to get Started?

Book in your service via our online booking form.You’ll receive confirmation when your request is confirmed by our workshop.

Performance drivetrain upgrades built around your vehicle

  • Transmission, gearbox and diff upgrades matched to power and intended use
  • Performance converters, clutches, ratios and cooling options available
  • More than 20 years of hands-on drivetrain and gearbox experience
Performance transmission and drivetrain upgrades for Hamilton and Waikato

Built around how you use the vehicle

There is no one-size-fits-all performance build.
Power, torque, vehicle weight, gearing, tyre size and intended use all influence what needs strengthening and what can stay standard.
The aim is to build the drivetrain around what you actually want the vehicle to do.

Automatic transmission and converter upgrades

Performance automatic builds can include strengthened internals, upgraded components, purpose-built torque converters and additional cooling.
External transmission coolers are matched to the vehicle’s power and workload to help control heat and improve reliability.
For standard repairs, see automatic transmission repairs and rebuilds.

Gearbox, clutch and differential upgrades

Manual gearboxes, clutches and differentials can also be upgraded to suit increased power or a different driving setup.
Options include clutch upgrades, ratio changes and limited-slip or Truetrac differentials to improve strength, acceleration or traction.
See manual gearbox and differential repairs for standard repair work.

Classics, modified cars and specialist builds



Classic and modified vehicles are a particular area of interest for Gary and the team.
With more than 20 years of drivetrain experience, Shifting Gears Automotive can help plan transmission, gearbox and differential upgrades around the vehicle rather than relying on an off-the-shelf package.
To discuss a build, contact Shifting Gears Automotive.

The build is based on factors such as engine output and torque, vehicle weight, gearing, tyre size and intended use, including street driving, track use or towing.

Yes. Depending on the transmission and application, upgrades may include strengthened internal components, a purpose-built torque converter and additional cooling.

Yes. Ratio changes can be considered to improve acceleration or reduce cruising RPM, depending on the vehicle, tyre size and how it is used.

Yes. Classic and modified vehicles are a particular area of interest for the team, with drivetrain builds planned around the vehicle’s existing setup, power and intended use.

Frequently Asked Questions for Performance Transmission & Drive Train Upgrades

Performance Transmission & Drive Train Upgrades Summary:

  • What: Performance transmission, gearbox and differential upgrades, including converters, clutches, ratios and cooling.

  • Where: Performance drivetrain upgrades for Hamilton and Waikato vehicles.

  • Who for: Owners of modified, classic, track and towing vehicles needing stronger or better-matched drivetrain components.
Gearbox, transmission and automotive repair specialists
Hamilton/Frankton