4TH GEAR PERFORMANCE / DALLAS, GEORGIA

SUPRA & JZ SERVICE + PERFORMANCE

MK3 · MK4 · JZ-POWERED APPLICATIONS

From a sound mechanical baseline to the supporting systems around a larger goal, we approach the JZ platform as part of the complete car.

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TWO GENERATIONS. A PLAN FOR THE WHOLE CAR.

Choose Your Supra

MK3 / A701JZ-GTEMK4 / A802JZ-GE · 2JZ-GTE

Explore MK3 / A70

01 / 04OVERVIEW
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Red MK3 A70 Toyota Supra parked outdoors

01 / OVERVIEW

MK3 / A70

A70 / JZ-POWERED APPLICATIONS / VERIFY THE CURRENT SETUP

The MK3 is the A70-generation Supra. Our focus here is JZ-powered examples: the 1JZ-GTE has a factory A70 application, but not every MK3 left Toyota with that engine. On an older or modified car, identify the installed engine, drivetrain and supporting hardware before planning service or upgrades.

1JZ engine and surrounding supporting components

02 / SERVICE NEEDS

START WITH A MECHANICAL BASELINE

Before recommending repairs or upgrades for your MK3 / A70, we establish its configuration, previous changes, current condition, and which systems need attention.

Engine & supporting systems — Confirm the installed JZ configuration; assess cooling, fuel, ignition, fluids, leaks and turbo hardware where applicable.

Drivetrain & chassis — Evaluate transmission, clutch, differential, brakes and suspension according to symptoms and history.

Integration & previous work — Understand wiring, swap integration and existing modifications before recommending changes.

Modified MK3 A70 Toyota Supra

03 / UPGRADE PATHS

BUILD TOWARD A DEFINED GOAL

A street refresh, a sharper performance car, and a larger build should not follow the same path. We match each change to how you want the car to perform and what the rest of the vehicle can support.

Street Refresh

Establish service history and address cooling, fluid leaks, worn suspension, brakes and driveline needs before adding more load.

Street Performance

Improve the existing combination with appropriate cooling, braking, suspension and drivetrain support for a dependable street car.

High Performance

Plan engine, fuel, cooling, clutch, transmission and differential requirements together with brakes and chassis control.

MK3 Toyota Supra on a city street

04 / FAQ

MK3 / A70 questions, answered.

Can you work on a JZ-swapped MK3?

Share the engine, transmission and known conversion details so we can confirm the scope. A 2JZ-powered MK3 is a modified configuration; we assess its installation and supporting systems accordingly.

I just bought a JZ-powered MK3. Where do we start?

Bring any records and describe current symptoms and goals. Establishing the installed combination and its condition helps prioritize maintenance, repairs and later upgrades.

Can you evaluate previous-owner modifications?

We can discuss diagnostics and mechanical evaluation of the existing work. Records, component details and a clear description of the concern help define the right starting point.

What should I address before increasing power?

Start with engine condition and the capacity of fuel, cooling and drivetrain systems, then include braking and suspension needs. The priorities depend on the current car and intended use.

Explore MK4 / A80

01 / 04OVERVIEW
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Red MK4 A80 Toyota Supra parked inside a building

01 / OVERVIEW

MK4 / A80

A80 / 2JZ-GE & 2JZ-GTE / INDIVIDUAL CONFIGURATIONS

The MK4 is the A80-generation Supra, with factory naturally aspirated 2JZ-GE and twin-turbo 2JZ-GTE applications. Not every MK4 is turbocharged. On modified examples, the engine designation is only a starting point: the installed turbo, fuel, cooling and drivetrain combination shapes the plan.

MK4 Toyota Supra with its engine bay visible

02 / SERVICE NEEDS

START WITH A MECHANICAL BASELINE

Before recommending repairs or upgrades for your MK4 / A80, we establish its configuration, previous changes, current condition, and which systems need attention.

Engine & fluid systems — Identify GE or GTE and current modifications; evaluate engine condition, cooling, fuel delivery, ignition and fluids.

Turbo & integration — Where fitted, understand the turbo hardware and supporting systems, including wiring and previous changes.

Complete-car condition — Assess transmission, clutch, differential, brakes and suspension in the context of symptoms, history and intended use.

Close-up of turbocharger hardware on a 2JZ installation

03 / UPGRADE PATHS

BUILD TOWARD A DEFINED GOAL

A street refresh, a sharper performance car, and a larger build should not follow the same path. We match each change to how you want the car to perform and what the rest of the vehicle can support.

Street Refresh

Address maintenance, cooling, fluid condition, leaks and age-related chassis wear to establish a dependable foundation.

Street Performance

Match cooling, brakes, suspension and drivetrain improvements to the current GE or GTE combination and everyday use.

High Performance

Plan the engine and any turbo changes alongside fuel delivery, cooling, transmission, differential, braking and chassis support.

Rear view of a black MK4 Toyota Supra

04 / FAQ

MK4 / A80 questions, answered.

Do you service both 2JZ-GE and 2JZ-GTE Supras?

This page covers both factory engine families. Tell us which engine and supporting hardware are currently installed so we can confirm the service scope for your car.

What should be inspected on a modified MK4?

The starting point depends on its history and symptoms. Engine condition, cooling, fuel, wiring integration and drivetrain support may all affect the plan, alongside brakes and suspension.

Can you evaluate an existing turbo, fuel and cooling combination?

We can discuss assessing the installed hardware and mechanical concerns. Component details and your intended use help establish compatibility and identify supporting-system needs.

Does a turbo conversion make a GE car a factory GTE?

No. A modified 2JZ-GE configuration should be identified as such. We plan around the engine and parts actually installed, rather than assuming factory GTE specifications.

COMPLETE-CAR SERVICE

SUPRA & JZ SERVICE, FROM BASELINE TO BUILD.

Maintenance, diagnostics, repair, and performance work approached with the engine, cooling, drivetrain, brakes, suspension, and chassis in context.

  • Maintenance
  • Diagnostics
  • Engine repair
  • Cooling systems
  • Fuel systems
  • Turbo & exhaust where applicable
  • Suspension
  • Brakes
  • Transmission & clutch
  • Performance upgrades
  • Mechanical refresh
  • Ignition
  • Electrical diagnosis
  • Drivetrain & differential

DEFINE THE OUTCOME

WHAT DO YOU WANT THE CAR TO DO?

01

Maintain It

Keep the car healthy, reliable, and current on the service that protects it.

02

Refresh It

Correct age, wear, deferred maintenance, and previous work so the car feels right again.

03

Upgrade It

Improve performance with changes chosen to work with the car's current configuration.

04

Build It

Plan a larger combination by matching the performance goal with the fuel, cooling, drivetrain, braking, and chassis support it needs.

2JZ engine bay showing engine and supporting hardware

BASELINE BEFORE UPGRADES

BUILD THE COMBINATION, NOT JUST THE JZ.

The engine gets the attention, but a dependable Supra is a complete system. We look at the JZ configuration alongside fuel delivery, cooling, wiring, transmission, differential, brakes, suspension, and previous work before deciding what comes next.

Whether the goal is a healthy street car or a larger performance build, the rest of the car has to be ready for what you're asking the engine to do.

Discuss your starting point
Modified MK3 Toyota Supra

PARTS THAT FIT THE PLAN

THE RIGHT PART SHOULD MAKE THE WHOLE CAR BETTER.

Good parts choices start with the exact vehicle, the hardware already installed, and what you're trying to accomplish. We use fitment and the larger plan to connect the part to the system around it.

SHOP SUPRA PARTS

HOW WE WORK

A CLEAR PATH FROM ASSESSMENT TO EXECUTION.

  1. 01

    TELL US ABOUT THE CAR

    What it is, what has been changed, what it's doing, and what you want from it.

  2. 02

    ESTABLISH THE BASELINE

    We verify the configuration, condition, service history, and previous work that matter to the job.

  3. 03

    DEFINE THE WORK

    We prioritize maintenance, repairs, and upgrades in the order that makes sense.

  4. 04

    EXECUTE THE PLAN

    We complete the agreed work with the supporting systems and end goal in mind.

WHY 4TH GEAR

PLATFORM KNOWLEDGE. WHOLE-CAR THINKING.

4th Gear combines a focused approach to Nissan, Infiniti, Supra, and modified JDM platforms with a systems-based approach to service and performance. We diagnose before replacing parts, account for the work that's already been done, and plan around how the engine, fuel, cooling, drivetrain, brakes, suspension, and chassis work together.

The goal isn't to put more parts on the car. It's to make the car better at what you want it to do.

YOUR SUPRA. YOUR JZ. A PLAN FOR THE WHOLE CAR.

MK3 or MK4, start with the current setup, define the goal and build the supporting systems around it.

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