OS Giken R200 : how to install and A Complete Guide

Introduction

Upgrading to an OS Giken R200 differential can Drastically enhance the handling, traction, and stability of your car. Whether you’re a track enthusiast or simply seeking better control on the road, this LSD (limited-slip differential) offers superior performance over factory-installed open differentials. This guide covers the tools, steps, and tips for a smooth installation of the OS Giken R200, commonly used in Nissan platforms like the 240SX, Skyline, and Z-series cars.

What is the OS Giken R200 LSD?

The OS Giken R200 is a high-performance limited-slip differential designed to distribute torque evenly between the two drive wheels, reducing wheel spin and improving traction. Unlike viscous or clutch-based LSDs, the OS Giken differential offers customizable lock-up strength, ensuring smooth power delivery under various driving conditions. This makes it a top choice for both racing enthusiasts and everyday drivers seeking a performance upgrade.

Tools and Materials Required

• Jack stands or a hydraulic lift
• Socket set and wrench (metric sizes)
• Torque wrench
• Gear oil (recommended OS Giken-specific oil)
• Differential cover gasket or RTV sealant
• Drain pan
• Pry bar or breaker bar
• Hammer and chisel (optional for stuck components)
• OS Giken R200 LSD
• Replacement axle seals (if needed)

Step-by-Step Installation

1: Preparing the Vehicle

1. Raise the Car Safely: Use jack stands or a lift to elevate the vehicle and ensure it is stable.
2. Drain Old Gear Oil: Place a drain pan under the differential and remove the drain plug to release the old oil. Allow it to drain completely.
3. Disconnect the Battery: Prevent accidental shorts by disconnecting the car battery before you begin.

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2: Removing the Old Differential

1. Detach Driveshaft and Axles: Use a socket set to unbolt the driveshaft and both axles from the differential.
2. Remove the Differential Bolts: Loosen and remove the bolts holding the differential to the subframe or mounting brackets.
3. Extract the Differential: Use a pry bar or breaker bar if the differential is stuck. Be cautious not to damage seals or surrounding components.

3: Preparing the Differential Housing

1. Inspect Bearings and Seals: Check the axle seals and bearings for wear. If damaged, replace them to avoid leaks.
2. Clean the Housing: Use a clean cloth to wipe out any residue or debris from the differential housing.
3. Set Preload and Clearance: If your OS Giken LSD isn’t pre-set, follow the provided instructions to adjust the preload for your driving style.

4: Installing the OS Giken R200 Differential

1. Position the New Differential: Carefully insert the OS Giken LSD into the housing, ensuring it aligns with the axles and driveshaft input.
2. Reattach the Bolts: Secure the differential to the subframe using the original bolts, and tighten them to the recommended torque specifications.
3. Reconnect the Axles and Driveshaft: Align and bolt the axles and driveshaft back to the differential.

5: Refill with New Gear Oil

1. Apply Gasket or RTV Sealant: Use RTV sealant or a new gasket for the differential cover to prevent leaks.
2. Fill with Recommended Oil: Pour in OS Giken-specific gear oil or a compatible lubricant until the differential reaches the correct fill level.

6: Test the Installation

1. Lower the Vehicle: Carefully lower the car back to the ground.
2. Reconnect the Battery: Restore power to the car by reconnecting the battery.
3. Take a Test Drive: Drive the car slowly and make a few tight turns to ensure the differential locks and unlocks correctly. Listen for any abnormal sounds or vibrations.

Tips for a Successful Installation

1. Use Correct Torque Settings: Follow your vehicle’s manual or OS Giken’s guide to tighten bolts to the correct specifications.
2. Inspect Axles During Installation: Check for worn axles and replace them if necessary. This will save you from future repairs.
3. Break-in the Differential: Some OS Giken LSDs require a break-in period. Change the gear oil after the first 500-1,000 miles to maintain peak performance.
4. Use the Right Oil: OS Giken differentials require specific lubricants designed for LSDs to function smoothly and last longer.

Benefits of the OS Giken R200 LSD

Upgrading to the OS Giken R200 LSD provides multiple benefits, including:

• Improved Traction: Prevents wheel spin by evenly distributing power to both wheels.
• Better Cornering: Enhanced control and stability during turns.
• Durability: Built to handle high-stress driving conditions, from track days to spirited street driving.
• Adjustable Locking: Preload adjustment allows you to fine-tune the differential for daily driving or track use.

Conclusion

The OS Giken R200 LSD is a powerful upgrade that transforms your car’s performance, offering superior traction, control, and stability. While the installation requires some mechanical know-how, following this guide will help you get the job done efficiently. Whether you’re preparing for the track or improving your daily driving experience, this differential upgrade ensures smoother handling and greater confidence behind the wheel.

Disclaimer: This guide provides general instructions for installing the OS Giken R200 differential. If you are unfamiliar with automotive installations or lack the necessary tools, consult a certified mechanic to avoid damage to your vehicle. Proper installation and maintenance are critical for optimal performance and longevity.