Name: Mazda MX-5 Miata NC / RX-8 - 6 Speed Manual Transmission MT6 Strengthening Upgrade Bundle
Brand: Performance Delta Ltd
SKU: MT6-BIL-PLTV2-BUND
Price: 219.99 GBP
Availability: InStock

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MT6 Gearbox Upgrade Builder

Build your NC MX-5 / RX-8 MT6 gearbox upgrade package. The bearing plate upgrade bundle includes the billet bearing plate, the brass gear change control and reverse gear bush upgrade; supporting tools and replacement shaft nuts can be added as required.

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Mazda MX-5 Miata NC / RX-8 - 6 Speed Manual Transmission MT6 Strengthening Upgrade Bundle

Discounted bundle of our EN24 billet bearing plate, change control bushings and reverse gear bush.

The Performance Delta Billet Bearing Plate is designed for the Mazda MX-5 NC and RX-8 6-speed MT6 manual transmission, designed to address the well-known weakness in the factory bearing plate Mazda used. The original cast aluminium bearing plate can flex under load, allowing the main and counter shafts to move out of alignment. This movement accelerates gear wear and, in severe cases, can lead to cracking of the factory plate and complete gearbox failure.

This upgrade replaces the factory component with a precision CNC-machined billet bearing retainer plate, dramatically increasing rigidity in this critical area of the gearbox. By maintaining correct shaft alignment under high torque and aggressive driving conditions, it significantly improves long-term gearbox durability for both road and track use.

Installation requires partial gearbox disassembly but does not involve any machining or permanent modification. For best results, installation should follow Mazda’s MT6 transmission overhaul procedures to ensure correct bearing preload and assembly.

Features:

EN24 steel billet gearbox bearing blate for Mazda MX-5 NC and RX-8 6-speed
4x stronger than the cast OEM piece
Reinforces a known weak point in the MT6 transmission
Reduces shaft movement and maintains correct gear alignment
Helps prevent accelerated gear wear and gearbox failure
Precision CNC-machined for strength and accuracy
No machining or permanent modification required
Suitable for fast-road, track, and high-torque applications

Change control system bushes replace the plastic bushes that can easily break on transmissions that see hard use on track. Made from brass to a tighter tolerance than the factory plastic bush. These slider blocks are sold as a set of 3 and can be easily installed while the gearbox is out of the car - takes 20 minutes.

This kit replaces the factory plastic bushes (P601-17-481) that are prone to breaking under hard use, especially on track. By upgrading to brass bushes, you ensure greater durability and precision in your transmission control system.

Features:

Compatible with Mazda MX-5 NC and RX-8 6-speed manual transmissions
Replaces factory plastic bushes (P601-17-481)
Made from durable brass for improved wear resistance
Tighter tolerances for enhanced transmission performance
Set includes 3 brass slider blocks
Installation time: approximately 20 minutes

Install guide can be found here

Reverse Change Bush for the Mazda MX-5 NC 6-speed gearbox replaces the factory plastic bushes in the reverse gear change mechanism. Under hard use, particularly on track-driven cars, the original plastic components are prone to wear or failure, leading to imprecise operation or loss of reverse engagement.

Manufactured from brass and machined to tighter tolerances than the OEM parts, this upgrade provides increased durability and improved shift consistency. By eliminating the weak plastic bushes, it offers a more reliable solution for vehicles subjected to aggressive driving conditions.

Features:

Reverse gear change control bush for Mazda MX-5 NC 6-speed
Replaces the factory plastic reverse change bush
Manufactured from brass for increased strength and durability
Machined to tighter tolerances than the OEM component
Improves the reliability of reverse gear engagement
Ideal for track-driven or hard-used vehicles
Direct replacement with no modification required

NOTE:

Always use a high-quality GL-4 transmission fluid; we do not recommend using GL-5.

Professional installation is recommended.
Gearbox modifications should be carried out by a competent installer.
Designed for motorsport and high-performance applications.
Follow the Mazda MT6 overhaul guide and bearing preload procedure.

Select added extras from the parts picker to build your fuel system.

We do our best to process and ship orders within 1-2 business days (Monday-Friday, excluding holidays). Delivery time depends on location. Below are examples:

UK: 24hrs

Europe: 3-5 days

America and Canada: 5-7 days

Australia: 5-7 days

If you have any questions about your order, you can reach out to our Customer Service team and we will be happy to help.

We Guarantee Everything We Make

If you are not satisfied with one of our products at the time you receive it, or if one of our products does not perform to your satisfaction, please get in touch and we'll make it right. We've been trading for over 2 years and not once had return due to fault or poor quality.