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The Mopar Performance 8-3/4 rear axle is a popular upgrade for many classic cars, especially for the 1968 GTX. This upgrade not only enhances performance but also improves reliability and handling. In this article, we will explore installation tips and power improvements associated with the 8-3/4 rear axle swap.
Why Upgrade to an 8-3/4 Rear Axle?
Upgrading to an 8-3/4 rear axle provides several advantages for the 1968 GTX:
- Strength: The 8-3/4 axle is known for its durability and can handle more power than the stock axle.
- Gear Ratio Options: This axle offers a variety of gear ratios, allowing for better performance tuning.
- Improved Traction: The wider axle improves traction, essential for high-performance applications.
- Ease of Maintenance: Parts for the 8-3/4 are widely available, making maintenance easier.
Preparing for the Swap
Before starting the installation, it’s important to gather the necessary tools and parts. Here’s what you’ll need:
- 8-3/4 rear axle assembly
- Wrenches and sockets (various sizes)
- Torque wrench
- Jack and jack stands
- Brake line kit
- New differential fluid
Step-by-Step Installation Guide
1. Remove the Old Axle
Start by safely lifting the vehicle and securing it on jack stands. Follow these steps to remove the old axle:
- Disconnect the battery to prevent any electrical issues.
- Remove the rear wheels.
- Unbolt the driveshaft from the rear axle.
- Disconnect the brake lines and remove the old axle assembly.
2. Install the 8-3/4 Rear Axle
With the old axle removed, it’s time to install the new 8-3/4 rear axle:
- Position the new axle in place and align it with the leaf springs.
- Secure the axle with the provided mounting hardware.
- Reconnect the driveshaft, ensuring proper alignment.
- Attach the brake lines, checking for any leaks.
3. Final Adjustments
After installation, make the necessary adjustments:
- Check the alignment of the rear wheels.
- Fill the differential with new fluid.
- Reattach the battery and wheels.
- Lower the vehicle and perform a test drive.
Power Improvements with the 8-3/4 Rear Axle
Upgrading to the 8-3/4 rear axle can significantly enhance the performance of your 1968 GTX. Here are some power improvements you can expect:
- Better Acceleration: The improved gear ratios allow for quicker acceleration.
- Increased Stability: The wider stance of the axle enhances vehicle stability during high-speed maneuvers.
- Enhanced Handling: Better traction leads to improved handling, especially in corners.
- Lower RPMs: Depending on the gear ratio, you may experience lower RPMs at highway speeds, improving fuel efficiency.
Common Issues and Solutions
While the installation of the 8-3/4 rear axle is generally straightforward, you may encounter some common issues:
- Noise from the Differential: Ensure that the differential is properly lubricated and check for any loose components.
- Brake Line Leaks: Double-check all connections and replace any damaged lines.
- Alignment Problems: If the vehicle pulls to one side, consider having a professional alignment performed.
Conclusion
The Mopar Performance 8-3/4 rear axle swap is an excellent upgrade for the 1968 GTX, providing enhanced performance and reliability. By following the installation tips and being aware of potential issues, you can successfully complete this upgrade and enjoy the benefits of improved power and handling.