THE ULTIMATE L322

Love your L322 TD6 but are worried about the inevitable 5 speed gearbox failure? Enhance your L322's performance and reliability with our ZF6HP26 – 6 speed automatic gearbox plug and play conversion. All original functions retained whilst opening the possibility of engine remapping for superb performance gains without the worry of destroying the gearbox. Make it the car it should have been from factory. Download the brochure to learn more or read more below.

Download Brochure

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The problem and the solution

The factory GM 5L40E 5‑speed automatic in the Range Rover L322 TD6 (2002–2006) is a well‑known weak point, operating beyond its torque rating and prone to failure. This ZF 6HP26 6‑speed conversion kit permanently solves the issue by replacing it with a far stronger, modern transmission engineered specifically for the TD6 platform.

Designed as a true plug‑and‑play upgrade, this conversion retains all original vehicle functions while unlocking improved reliability, drivability, and future performance potential.

Key benefits

Replaces the failure‑prone GM 5‑speed with a 600 Nm‑rated ZF 6HP26

No chassis or driveline modifications required

Retains factory shifter, transfer case, and OEM functionality

Plug‑and‑play electronics using OEM connectors

Enables engine remapping and performance upgrades with confidence

Sixth gear provides improved cruising efficiency

What’s included

The upgrade Kit includes everything required for a true plug‑and‑play conversion, engineered to fit the factory layout with no chassis cutting, fabrication, or custom wiring. The ZF 6HP26 gearbox installs directly into the original 5‑speed footprint and retains the original transfer case mounts, driveshafts, shifter, cooler lines, and vehicle functions. Each component has been developed for reliability, seamless integration, and long‑term serviceability.

The complete kit includes:

Engine adapter plate

Transfer case adapter plate

Crank shaft adapter

Electronic interface ECU

5L to 6HP adapter loom

5L to 6HP Cooler line adapter block

Modified shift lever

Shift cable mounting bracket

ECU adjustment for 6th gear

All required bolts and fastening hardware

Full installation instructions (PDF)

Video guide for key parts

6HP Gearbox Installation Process Videos

There are many question on how hard or easy the conversion process is. This install video series shows how straight forward and simple the process is and how is can be completed in a basic workshop. Click an installation step to load the video, watch them from step 1 to 12 as this walks through the whole process. The player will automatically load and play your selection.

1 — Conversion Introduction

THE ULTIMATE L322

The problem and the solution

Key benefits

What’s included

Kit Price - $2960AUD

Quick shipping estimate

6HP Gearbox Installation Process Videos