350Z Final Drive Installation: Save Money with a DIY Approach

The Nissan 350Z, a beloved sports car, can benefit significantly from upgrading its final drive. Whether you're aiming for improved acceleration off the line, higher top speeds, or a more refined driving experience at higher RPMs, a final drive swap can dramatically alter your car's character. But professional installation can be expensive. This guide explores how to tackle a 350Z final drive installation yourself, saving you money while gaining valuable mechanical experience.

Disclaimer: This guide provides general information and should not be considered a professional instruction manual. Improper installation can damage your vehicle. Always consult your vehicle's repair manual and proceed with caution. This project requires mechanical aptitude and specialized tools. If you're uncomfortable with any step, seek professional assistance.

Why Swap Your Final Drive?

Before diving into the installation, let's understand why you might want to upgrade your 350Z's final drive. Different final drive ratios alter the relationship between engine RPM and vehicle speed.

• Shorter Final Drive (Higher Numerical Ratio): This results in quicker acceleration but lower top speed. Ideal for drag racing or spirited street driving.

• Longer Final Drive (Lower Numerical Ratio): This improves top speed and fuel economy at highway speeds, but acceleration is less aggressive. Beneficial for long-distance driving or track days emphasizing high-speed cornering.

Tools and Materials You'll Need

This is not an exhaustive list, but it covers the essentials. Consult your specific final drive's instructions and your vehicle's service manual for a complete list.

• Jack and Jack Stands: Essential for safely lifting the vehicle.
• Torque Wrench: Absolutely crucial for tightening bolts to the manufacturer's specifications. Using the wrong torque can lead to damage.
• Socket Set and Wrenches: A variety of sizes will be needed.
• Drain Pan: To catch the transmission fluid.
• New Transmission Fluid: Use the recommended fluid for your 350Z's transmission.
• New Final Drive: Ensure compatibility with your 350Z's year and model.
• Service Manual: This will provide detailed diagrams and torque specifications.
• Shifter Bushings and other maintenance parts: while you're at it consider replacing worn parts such as shifter bushings for a better feel.

Step-by-Step Installation Guide (Simplified Overview)

This is a simplified overview. The exact steps will vary depending on your 350Z's year and the specific final drive you're installing. Always refer to your service manual and the final drive's instructions for detailed, accurate procedures.

1. Preparation: Securely lift the vehicle and support it on jack stands. Drain the transmission fluid.

2. Driveshaft Removal: Disconnect the driveshaft(s) from the differential. This often involves removing bolts and possibly a center bearing support.

3. Differential Removal: Unbolt the differential from the transmission. This may involve removing various brackets, bolts, and potentially the axles. Pay close attention to the sequence of removal and bolt locations.

4. Final Drive Replacement: Carefully replace the old final drive with the new one, paying attention to any shims or adjustments necessary.

5. Reassembly: Reassemble everything in the reverse order of disassembly, ensuring all bolts are tightened to the correct torque specifications.

6. Refill Transmission Fluid: Refill the transmission with the correct type and amount of fluid.

7. Testing: Lower the vehicle and test drive it carefully to ensure everything is functioning correctly.

Frequently Asked Questions (FAQs)

How much can I save by doing this DIY?

The savings can be substantial. Professional labor costs for a final drive installation can range from several hundred to over a thousand dollars, depending on location and shop. By doing it yourself, you only pay for parts.

What are the potential risks of a DIY final drive installation?

Improper installation can lead to transmission damage, driveshaft issues, or even accidents. Incorrect torque settings are a major concern.

How long does it take to install a 350Z final drive?

Experienced mechanics can usually complete this in a few hours, but expect to spend a full day or longer, especially for your first time.

Do I need any special tools for this job?

Yes, you'll need a torque wrench, a transmission jack (highly recommended), and possibly special sockets or tools depending on your vehicle's year and the final drive.

Where can I find a replacement final drive for my 350Z?

Used parts are often available online through automotive marketplaces or from salvage yards. New parts can be sourced from Nissan dealerships or specialized performance parts suppliers. Ensure compatibility before purchasing.

This guide provides a basic overview. Thorough research and preparation are essential for a successful 350Z final drive installation. Remember safety first, and don't hesitate to seek professional help if needed. Happy wrenching!