$32,900
LT1
Land Rover Defender LT1 & 8L90 Conversion Kit
A complete, US-engineered installation kit. Matched direct-injection V8 powertrain, advanced electronics, cooling strategy, fuel delivery, exhaust system, ancillaries, and all installation hardware — built for North American roads/highways and premium Defender builds.
What's Inside the Kit
ENGINE
GM - LT1 6.2L Direct Injection V8
GM - LT1 High-Pressure Fuel Pump
GM - LT1 Accessory Drive System
TRANSMISSION & ADAPTER
GM 8L90 8-Speed Automatic Transmission
RRO - Transfer Case Adapter
RRO - Transmission Crossmember
Transmission Cooler
Stainless Steel Braided Transmission Cooler Lines
PROP SHAFTS
New Front and Rear Prop Shafts (Includes Hardware)
ELECTRICAL ASSEMBLIES
GM LT1 Engine Control Module (ECU) + Integrated Direct Injection Wire Harness w/Control Seals
OBD-II Diagnostic Port
Temperature Sensor Package
RRO - Proprietary Mounting Hardware
GEAR SHIFT ASSEMBLY
Gear Shifter - LoCar Shifter w/Indicator Strip
RRO - Proprietary Mounting Hardware
RADIATOR PACKAGE
High-Capacity Aluminum Radiator
Radiator Hoses
Dual Electric Cooling Fans
RRO - Proprietary Mounting Hardware
EXHAUST SYSTEM
RRO - LT1-Specific Header System
RRO - 3" Std Aluminized Steel Center Silencer
RRO - 3" Std Aluminized Steel Tailpipe
FUEL SYSTEM
RRO - HF-1 Proprietary High-Flow In-Tank Fuel Pump
Direct Injection Compatible Fuel Delivery System
In-Line Fuel Filter
Gates Fuel Line AN Connections
AUXILIARY COMPONENTS
Electric/Hydraulic Power Steering
Optional A/C Integration
What This System Is Not
• Not a generic LT swap kit
• Not a crate engine drop-in
• Not a repurposed wiring harness
• Not an unvalidated driveline solution
• Not an emissions-uncertain adaptation
This is a complete integration platform — developed through real-world Defender builds and engineered specifically for the chassis.
Investment
System pricing varies based on:
• Transmission selection
• Drive orientation
• Installation pathway
• Optional upgrades
Installed conversion projects typically range:
$65,000 – $90,000
Final investment determined during structured consultation.
Ready to Modernize Your Defender?
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Overview
The Rad-Rover LT1 Defender Conversion System delivers modern 6.2L direct-injection V8 performance with structured integration engineered specifically for the Defender chassis.
This is not a generic LT swap.
It is a complete, platform-specific system refined through more than 100 Defender and Series conversions — developed, tested, and hand-built in Ames, Iowa · USA.
The LT1 Platform
The 6.2L GM LT1 represents the evolution of the modern small-block V8.
With direct injection, refined throttle calibration, and broader torque mapping, it delivers premium drivability without sacrificing performance.
Typical Output:
455–480 horsepower
455+ lb-ft torque
Characteristics:
• Broader torque curve than LS3
• Direct injection efficiency
• Refined throttle response
• Modern engine management
• Strong nationwide parts support
It transforms a Defender from classic utility platform into modern high-performance machine — with smooth, composed V8 authority.
Engineered for Defender Chassis
The Defender platform presents unique engineering challenges:
• Limited frontal airflow
• Tight engine bay packaging
• Steering clearance constraints
• Transfer case alignment sensitivity
Our system addresses these directly.
Mount placement, cooling design, and driveline geometry are developed specifically for Defender architecture — not adapted from generic LS kits.
Transmission Options
8L90 Automatic
• Modern 8-speed refinement
• Reduced highway RPM
• Optimized shift mapping
• Ideal for daily-driven or premium builds
Manual Transmission (select configurations)
• Retained analog engagement
• Proper clutch and pedal integration
• Defender-compatible alignment
Transmission integration includes driveline alignment and transfer case compatibility.
Why Rad-Rover
Few engineer them properly for the Defender platform.
Rad-Rover combines:
• In-house fabrication
• Structured cooling solutions
• Refined driveline geometry
• Clean electrical integration
• Real-world installation experience
Engineered + Hand-Built in Ames, Iowa · USA.