4mm Aluminium Gearbox Guard for Toyota Land Cruiser Prado 120 J120 2002–2009

This heavy-duty 4mm Aluminium Gearbox Guard is designed to protect the gearbox and transmission area of the Toyota Land Cruiser Prado 120 / J120 manufactured between 2002 and 2009.

Manufactured from substantial 4mm aluminium plate, the guard provides strong drivetrain protection while keeping overall weight lower than a comparable heavy-duty steel guard. This makes it particularly suitable for overland, expedition and touring builds where controlling additional vehicle weight is important.

The main protection plate is aluminium, while the mounting brackets are manufactured from steel to provide secure vehicle attachment. External aluminium reinforcement sections further increase resistance to impact and deformation, and the complete assembly is powder coated for additional corrosion protection. :contentReference[oaicite:0]{index=0}

Vehicle Compatibility: Toyota Land Cruiser Prado 120 / J120 2002–2009

Engine Compatibility: 3.0 and 4.2 Diesel

Important Installation Requirement: This gearbox guard cannot be installed without the matching 4mm Aluminium Engine & Sump Guard. The front guard is a mandatory part of the aluminium underbody protection system. :contentReference[oaicite:1]{index=1}

Build a complete Prado 120 underbody protection package:
4mm Aluminium Engine & Sump Guard for Toyota Land Cruiser Prado 120
4mm Aluminium Gearbox Guard for Toyota Land Cruiser Prado 120
Steel Engine & Sump Guard for Toyota Land Cruiser Prado 120
Steel Gearbox Guard for Toyota Land Cruiser Prado 120
Steel Fuel Tank Guard for Toyota Land Cruiser Prado 120 – 5 Door
Steel Fuel Tank Guard for Toyota Land Cruiser Prado 120 – 3 Door

Explore more underbody protection:
Steel & Aluminium Underbody Protection

Key Features

• Designed for Toyota Land Cruiser Prado 120 / J120
• Vehicle application: 2002–2009
• Protects the gearbox / transmission area
• Manufactured from 4mm thick aluminium plate
• External aluminium reinforcement sections improve impact resistance
• Steel mounting brackets for secure attachment
• Powder-coated finish for additional corrosion protection
• Approximate weight: 9kg
• Suitable for 3.0 and 4.2 diesel engines
• Designed around factory mounting locations
• Screws, nuts, clips and fastening accessories included
• 24-month manufacturer warranty
• Requires matching aluminium engine & sump guard
• Ideal for overland, touring, expedition and off-road builds

Vehicle Compatibility

Technical Overview

Important – Matching Aluminium Sump Guard Is Required

This gearbox guard cannot be installed as a standalone component.

The matching 4mm Aluminium Engine & Sump Guard for Toyota Land Cruiser Prado 120 / J120 is mandatory for correct installation. The front guard provides part of the required mounting and structural continuation for the gearbox protection system. :contentReference[oaicite:2]{index=2}

Required product:
4mm Aluminium Engine & Sump Guard for Toyota Land Cruiser Prado 120 J120 2002–2009

Why Protect the Gearbox?

The gearbox sits along the central underside of the Prado 120 and can be exposed when driving through deep ruts, rocky tracks, raised centre sections and uneven terrain.

A direct impact to the transmission casing can result in cracking, deformation or fluid loss. In serious cases, damage to the gearbox can immobilise the vehicle and create costly recovery and repair work.

A dedicated aluminium gearbox guard creates a protective barrier beneath the transmission, helping absorb and distribute impacts before they reach critical drivetrain components.

4mm Aluminium Drivetrain Protection

The use of 4mm aluminium plate provides substantial impact protection while keeping weight significantly lower than a comparable steel guard.

At approximately 9kg, this guard is particularly attractive for vehicles already carrying additional touring equipment, roof racks, tents, recovery gear, bumpers or suspension upgrades. :contentReference[oaicite:3]{index=3}

Reducing weight in individual armour components can make a meaningful difference to the overall vehicle build, particularly when multiple protection plates are installed together.

Aluminium Plate with Steel Mounting Brackets

The main shield is manufactured from aluminium, while the mounting brackets are manufactured from steel. :contentReference[oaicite:4]{index=4}

This combination allows the guard to benefit from the lower weight and corrosion resistance of aluminium while retaining strong steel attachment points at the chassis mounting locations.

All required mounting accessories are included with the guard. :contentReference[oaicite:5]{index=5}

Reinforced for Off-Road Impacts

The exterior of the gearbox guard incorporates additional aluminium reinforcement sections that increase resistance to impacts and help reduce deformation when the vehicle contacts rocks, trail debris or raised ground. :contentReference[oaicite:6]{index=6}

This reinforced design makes the guard suitable for vehicles used regularly away from paved roads.

Complete Aluminium Prado 120 Protection System

This gearbox guard forms the second section of the aluminium underbody protection package.

• 4mm Aluminium Engine & Sump Guard – Prado 120 J120 – mandatory
• 4mm Aluminium Gearbox Guard – Prado 120 J120 – this product

The front guard protects the engine, sump and radiator area, while this gearbox guard continues the protection rearwards beneath the transmission.

Steel Protection Alternatives

Customers who prefer steel underbody armour can choose the matching steel protection range instead.

• Steel Engine & Sump Guard – Prado 120 J120
• Steel Gearbox Guard – Prado 120 J120
• Steel Fuel Tank Guard – Prado 120 J120 5-Door
• Steel Fuel Tank Guard – Prado 120 J120 3-Door

Aluminium vs Steel Gearbox Protection

The best choice depends on the overall vehicle build, expected terrain and how important weight saving is to the application.

Ideal Uses

• Overlanding
• Expedition travel
• Green-laning
• Rocky tracks
• Deep ruts
• Forestry and agricultural roads
• Remote touring
• Water crossings with hidden obstacles
• Working vehicles
• Daily-driven 4x4s requiring additional gearbox protection

What’s Included

• 1 × 4mm aluminium gearbox guard
• Steel mounting brackets
• Mounting screws / bolts
• Nuts
• Clips
• Required fastening accessories
• Installation manual

Important: The matching aluminium engine & sump guard is required and is sold separately unless specifically stated otherwise.

Recommended Supporting Upgrades

• 4mm Aluminium Engine & Sump Guard for Toyota Land Cruiser Prado 120 – required
• Steel Fuel Tank Guard – Prado 120 5-Door
• Steel Fuel Tank Guard – Prado 120 3-Door
• Differential protection
• Rock sliders / heavy-duty side protection
• Recovery points
• Suspension lift kit
• Off-road wheels and tyres
• Raised air intake / snorkel

Installation

• The matching 4mm aluminium engine & sump guard must be fitted
• Designed around factory mounting holes
• No structural vehicle alteration should normally be required
• Mounting hardware is included
• Installation manual is supplied
• Install fixings loosely before final alignment and tightening
• Check clearance around gearbox, exhaust and moving drivetrain components
• Re-check all mounting hardware after initial off-road use
• Professional installation is recommended if the vehicle has corrosion or previous underbody modifications

Estimated fitting time: approximately 1–2 hours once the matching front aluminium guard is installed, depending on vehicle condition and workshop equipment.

Warranty

This underbody guard is supplied with a 24-month manufacturer's warranty. :contentReference[oaicite:7]{index=7}

FAQs

Q1: What vehicle does this aluminium gearbox guard fit?
A: It is designed for Toyota Land Cruiser Prado 120 / J120 models manufactured between 2002 and 2009.

Q2: Which engines are compatible?
A: The supplier lists this application for 3.0 and 4.2 diesel engine versions. :contentReference[oaicite:8]{index=8}

Q3: How thick is the aluminium?
A: The gearbox guard is manufactured from 4mm thick aluminium.

Q4: How much does the guard weigh?
A: The guard weighs approximately 9kg. :contentReference[oaicite:9]{index=9}

Q5: Can I install this gearbox guard without the aluminium engine guard?
A: No. The matching aluminium engine & sump guard is mandatory for correct installation. :contentReference[oaicite:10]{index=10}

Q6: Are the mounting brackets aluminium?
A: No. The main protection shield is aluminium while the mounting brackets are steel. :contentReference[oaicite:11]{index=11}

Q7: Is the guard reinforced?
A: Yes. External aluminium reinforcement sections improve resistance to impact and deformation. :contentReference[oaicite:12]{index=12}

Q8: Is the guard powder coated?
A: Yes. The protection assembly is powder coated to provide additional corrosion protection. :contentReference[oaicite:13]{index=13}

Q9: Are mounting components included?
A: Yes. Screws, nuts, clips and all required fastening accessories are included. :contentReference[oaicite:14]{index=14}

Q10: Does installation require drilling?
A: The guard is designed around factory screw holes, so structural modification should not normally be required. :contentReference[oaicite:15]{index=15}

Q11: Can I combine the aluminium guards with steel fuel tank protection?
A: Yes. The aluminium engine and gearbox guards can be combined with the appropriate steel fuel tank guard for the 3-door or 5-door Prado 120.

Q12: Is aluminium better than steel for touring?
A: Aluminium is often attractive for touring and overland vehicles because it offers strong protection with lower weight and excellent corrosion resistance. Steel remains a strong option where weight saving is less important.

Q13: Can this be fitted to a lifted Prado 120?
A: Yes. A conventional suspension lift does not normally affect installation provided the original chassis and mounting arrangement has been retained.

Q14: Can the guard be removed for gearbox servicing?
A: Yes. It can be removed when access to the transmission or surrounding drivetrain components is required.

Why Buy from OFM4x4.CO.UK

• Toyota Land Cruiser off-road upgrade specialists
• Choice of steel or aluminium Prado 120 underbody protection
• Complete engine, gearbox and fuel tank protection solutions
• Technical support before and after purchase
• UK-based customer service
• Carefully selected equipment for touring, overland and expedition builds