Toyota Supra MK4 5 speed gearbox swap kit 2JZ GE

Toyota Supra MK4 (JZA80) with a non-turbo 2JZ-GE from an automatic to a 5-speed manual typically involves sourcing components for the W58 transmission, which was the factory-standard 5-speed for the GE engine.

While the W58 is a “direct fit,” many owners pushing higher power eventually look toward the R154 (from the MK3 Turbo/Chaser) due to its higher torque capacity.

1. The Factory-Style Swap (W58)

This is the most straightforward “OEM+” swap. It uses the transmission originally designed for the naturally aspirated 2JZ-GE.

• Transmission: W58 (Ensure it is the “extended housing” version from an SC300 or MK4 Supra to line up with the shifter hole).

• Bellhousing: JZ-to-W series bellhousing.

• Flywheel: 2JZ-GE specific 5-speed flywheel.

• Clutch: Standard 225mm or 236mm push-type clutch.

• Pedal Assembly: MK4-specific manual brake and clutch pedals.

• Master/Slave Cylinders: MK4 5-speed master cylinder and W58 slave cylinder.

2. The Heavy-Duty Swap (R154)

If you plan to NA-T (Turbocharge) your 2JZ-GE later, the W58 may fail above 350–400 hp. The R154 is the preferred 5-speed upgrade.

• Bellhousing: You will need a specialized 1JZ/2JZ to R154 bellhousing (often sourced from the JDM JZX100 Chaser).

• Clutch Type: The R154 is a pull-type clutch system, unlike the W58’s push-type. You will need a conversion kit or a pull-type pressure plate.

• Driveshaft: The R154 has a different output spline than the W58 or Automatic; a custom driveshaft or an R154-specific front yoke is required.

Swap Kit Component Checklist

To complete a full conversion on an MK4 chassis, you will need the following “hard parts”:

Technical Considerations

• Transmission Tunnel: The MK4 automatic tunnel has a slightly different “hump” than the manual version. You will need to remove the automatic shifter plate and potentially trim the metal opening to fit the manual shifter housing.

• Differential Gearing: Automatic 2JZ-GE Supras typically have a 4.08 or 4.27 rear gear ratio. This makes for very “short” gears with a 5-speed, resulting in high RPMs at highway speeds. Many owners swap to a 3.7X or 3.9X ring and pinion for a better cruising experience.

Sourcing “Like New” Components

Given your focus on high-quality components, look for kits that include:

• Billet Shifter Housings: Reduces the “sloppy” feel common in old W58 units.