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Upgrading the rear gear in your AMC Javelin can significantly enhance its acceleration, providing a more exhilarating driving experience. This guide will walk you through the steps to install a 3.73 rear gear, with an estimated cost of around $500 for parts and labor.
Understanding the Benefits of a 3.73 Rear Gear
A 3.73 rear gear ratio offers a balance between acceleration and highway efficiency. Here are some key benefits:
- Improved Acceleration: A higher gear ratio allows for quicker acceleration, making your Javelin feel more responsive.
- Better Torque Delivery: This gear setup increases torque at the wheels, enhancing performance during takeoff.
- Enhanced Driving Experience: The overall driving feel becomes sportier, making your Javelin more fun to drive.
Tools and Materials Needed
Before starting the installation, gather the necessary tools and materials:
- 3.73 rear gear set
- New pinion bearing
- New ring gear bolts
- Gear oil
- Socket set
- Torque wrench
- Jack and jack stands
- Safety goggles and gloves
Step-by-Step Installation Process
1. Prepare Your Workspace
Ensure you have a clean, well-lit workspace. Use jack stands to lift the rear of the vehicle securely.
2. Remove the Differential Cover
Start by draining the old gear oil. Remove the differential cover using a socket set. Clean the mating surfaces to prepare for reassembly.
3. Remove the Old Gear Set
Take out the ring gear and pinion. Pay attention to the setup of shims and bearings as you disassemble. This will aid in reassembly.
4. Install the New 3.73 Gear Set
Install the new pinion bearing and place the 3.73 ring gear onto the differential. Ensure it is aligned properly and torque the bolts to the manufacturer’s specifications.
5. Set the Pinion Depth
Adjust the pinion depth using shims. This step is crucial for ensuring proper gear mesh and performance. Refer to the gear manufacturer’s specifications for guidance.
6. Adjust the Backlash
Check and adjust the backlash between the ring and pinion gears. This setting affects the performance and longevity of the gears.
7. Reassemble the Differential
Once the adjustments are made, reassemble the differential by replacing the cover and ensuring all bolts are properly torqued.
8. Fill with New Gear Oil
Fill the differential with fresh gear oil. Make sure to use the type recommended for your Javelin.
Cost Breakdown
The estimated cost for this installation is around $500, which includes:
- Parts: Approximately $350 for the gear set, bearings, and bolts.
- Labor: Approximately $150 if you choose to have a professional perform the installation.
Final Thoughts
Installing a 3.73 rear gear in your AMC Javelin can transform your driving experience. With the right tools and a bit of patience, you can achieve better acceleration and performance. Always remember to follow safety precautions and consult with professionals if you’re unsure about any steps in the process.