Spohn TB-104R Adjustable Rear Panhard Track Bar Instruction Manual

1. Introduction

This manual provides detailed instructions for the installation, adjustment, and maintenance of the Spohn TB-104R Adjustable Rear Panhard Track Bar. This component is designed to enhance the lateral stability and alignment of the rear axle housing in 2002-2009 GM Trailblazer, Envoy, SSR, and Bravada vehicles, particularly after modifications such as lowering or lifting the ride height. Proper installation and adjustment are crucial for optimal performance and vehicle safety.

2. Safety Information

Always prioritize safety when working on your vehicle. Failure to follow safety precautions can result in serious injury or damage to the vehicle.

• Ensure the vehicle is securely supported on jack stands on a level surface before beginning any work. Never rely solely on a jack.
• Wear appropriate personal protective equipment, including safety glasses and gloves.
• Use the correct tools for each task.
• If you are unsure about any step, consult a qualified automotive technician.
• Keep hands and clothing clear of moving parts.

3. Tools Required

The following basic hand tools are typically required for installation:

• Socket/Wrench Set (appropriate sizes for factory mounting hardware)
• Torque Wrench
• Jack and Jack Stands
• Measuring Tape or Ruler
• Grease Gun (for polyurethane bushings)
• Penetrating Oil (optional, for stubborn bolts)

4. Setup and Installation

The Spohn TB-104R Panhard Track Bar is designed for a 100% bolt-in installation, reusing factory mounting hardware.

1. Prepare the Vehicle: Park the vehicle on a level surface. Engage the parking brake. Loosen the rear wheel lug nuts, then raise the rear of the vehicle using a jack and support it securely with jack stands under the frame. Remove the rear wheels.
2. Locate the Factory Panhard Bar: Identify the existing rear panhard bar, which connects the rear axle to the vehicle frame.
3. Remove Factory Panhard Bar: Carefully remove the bolts securing the factory panhard bar at both ends. It may be necessary to slightly raise or lower the axle with the jack to relieve tension on the bolts. Keep the factory hardware for reuse.
4. Install Spohn TB-104R Panhard Bar: Position the new Spohn TB-104R Adjustable Rear Panhard Track Bar into place. Use the factory mounting hardware to loosely attach both ends of the new bar. Do not fully tighten at this stage.

5. Initial Adjustment (Centering the Axle): With the vehicle's weight on the suspension (you may need to carefully lower the vehicle onto ramps or place jack stands under the axle), measure the distance from the tire to the fender on both sides of the vehicle. The goal is to achieve equal distances, indicating the rear axle is laterally centered. Adjust the length of the panhard bar by rotating the center adjustment sleeve until the axle is centered.
6. Tighten Hardware: Once the axle is centered, fully tighten all mounting hardware to the manufacturer's recommended torque specifications.
7. Final Checks: Reinstall the wheels and lower the vehicle completely. Perform a final visual inspection to ensure all components are securely fastened and there is no interference with other vehicle parts.

5. Operating (Adjustment)

The Spohn TB-104R features a right-hand and left-hand threaded CNC machined 4140 chrome moly double adjuster, allowing for precise on-the-truck adjustments.

• Purpose of Adjustment: The primary purpose of the adjustable panhard bar is to laterally center the rear axle housing. This is particularly important after altering the vehicle's ride height (e.g., installing a lift kit or lowering springs), which can shift the axle off-center.
• Adjustment Procedure:
  1. Loosen the jam nuts on the adjustment sleeve.
  2. Rotate the center adjustment sleeve to lengthen or shorten the bar. Lengthening the bar will move the axle to one side, while shortening it will move it to the other.
  3. Continuously measure the distance from the tires to the fenders on both sides to ensure the axle is centered.
  4. Once the desired axle position is achieved, tighten the jam nuts securely to lock the adjustment in place.
• Clearance: Proper adjustment ensures adequate clearance when running larger tires, preventing rubbing issues.

6. Maintenance

Regular maintenance ensures the longevity and optimal performance of your Spohn TB-104R Panhard Track Bar.

• Lubrication: The panhard bar is equipped with fluted polyurethane bushings and grease fittings. Periodically lubricate these bushings using a grease gun to prevent squeaking and ensure smooth operation. The frequency of lubrication depends on driving conditions and mileage, but a general recommendation is every 3,000-5,000 miles or during routine oil changes.
• Inspection: Regularly inspect the panhard bar for any signs of wear, damage, or loose hardware. Check the bushings for cracks or deterioration. Ensure the adjustment jam nuts remain tight.
• Cleaning: Keep the bar clean from excessive dirt and debris, especially around the adjustment threads and bushings.

7. Troubleshooting

• Axle Not Centered: If the rear axle appears off-center after installation, re-check your measurements and repeat the adjustment procedure (Section 5). Ensure the vehicle's weight is on the suspension during measurement and adjustment.
• Squeaking Noises: Squeaking from the panhard bar typically indicates dry polyurethane bushings. Lubricate the bushings thoroughly using a grease gun. If squeaking persists, inspect the bushings for damage or improper installation.
• Loose Feeling in Rear End: A loose or unstable feeling in the rear of the vehicle could indicate loose mounting hardware or an improperly adjusted panhard bar. Inspect all bolts for proper torque and verify the axle is centered.
• Difficulty Adjusting: If the adjustment sleeve is difficult to turn, ensure the jam nuts are fully loosened. Clean any dirt or corrosion from the threads. A small amount of penetrating oil may assist.

8. Specifications

9. Warranty Information

For detailed warranty information regarding the Spohn TB-104R Adjustable Rear Panhard Track Bar, please refer to the official Spohn Performance website or contact their customer support directly. Warranty terms and conditions may vary.

10. Support

If you encounter any issues or have questions not covered in this manual, please contact Spohn Performance customer support through their official channels. When contacting support, please have your product model number (TB-104R) and vehicle information readily available.