Monroe Load Adjusting 58644 Suspension Shock Absorber and Coil Spring Assembly User Manual

Introduction

This manual provides essential information for the installation, operation, and maintenance of your Monroe Load Adjusting 58644 Suspension Shock Absorber and Coil Spring Assembly. Designed for vehicles that frequently carry varying loads or tow, these shock absorbers enhance control and stability.

Compatibility

The Monroe Load Adjusting 58644 Suspension Shock Absorber and Coil Spring Assembly is compatible with the following vehicles:

• 2002-2006 Chevrolet Trailblazer EXT
• 2002-2009 Chevrolet Trailblazer
• 2004-2005 GMC Envoy XUV
• 2002-2006 GMC Envoy XL
• 2002-2009 GMC Envoy

Always verify compatibility with your specific vehicle's year, make, model, engine, and trim before purchase and installation.

Key Features

The Monroe Load Adjusting 58644 Suspension Shock Absorber and Coil Spring Assembly offers several features designed to improve vehicle performance and handling:

• Reduces Sag Under Load: Ideal for vehicles that occasionally haul or tow varying loads. A heavy-gauge, calibrated coil spring helps reduce vehicle sag when loaded, supporting up to 1,200 lbs of additional weight. Note that capacity is limited by vehicle suspension, tires, and transmission; consult your vehicle's owner's manual.
• Exceptional Handling: Tuned specifically for each application, the full-displaced valving automatically adjusts to road extremes, providing consistent ride quality and enhanced control.
• Consistent Ride: Features OE all-weather fluid with special modifiers to handle extreme temperatures. A PTFE-banded piston reduces friction between the piston and pressure tube, enhancing responsiveness to changing road surfaces.
• Longer Service Life: A self-lubricating fluid seal retains gas and minimizes excessive friction against the piston rod, helping to reduce premature wear. The heavy-duty nitrocarburized rod contributes to long-lasting durability.
• Improves Performance: Nitrogen gas-charge maintains tire-to-road contact for improved ride and handling by reducing aeration and shock fade.

Image: Two Monroe Load Adjusting Shock Absorbers, showcasing the integrated coil springs.

Image: Diagram highlighting key features such as reduced sag under load, consistent ride, exceptional handling, and longer service life.

Setup and Installation

Installation of the Monroe Load Adjusting 58644 Shock Absorber is generally straightforward for those with mechanical experience. It typically involves removing two bolts (one at the top, one at the bottom) to replace the old unit with the new one. It is recommended to lift the vehicle from the frame, not the axle, to allow the suspension to fully extend, which simplifies the installation process.

Image: A mechanic inspecting a vehicle's suspension components, emphasizing the importance of proper inspection during installation.

For optimal safety and performance, professional installation is highly recommended. Ensure all bolts are torqued to the manufacturer's specifications.

Operating Principles

The Monroe Load Adjusting Shock Absorbers are designed to automatically adapt to varying load conditions. The integrated heavy-gauge coil spring provides additional support to the vehicle's rear suspension, preventing excessive sag when carrying heavy cargo or towing. This ensures that the vehicle maintains a more level stance, improving handling, braking, and overall stability, especially under demanding conditions.

Image: A black pickup truck, illustrating the type of vehicle that benefits from load-adjusting suspension for stability.

Image: A person loading items into a truck bed, demonstrating the utility of load-adjusting shocks for carrying heavy loads.

Maintenance

To ensure the longevity and optimal performance of your Monroe Load Adjusting Shock Absorbers, consider the following maintenance tips:

• Regular Inspection: Periodically inspect the shock absorbers for any signs of leakage, damage, or wear. Check the coil springs for cracks or deformation.
• Cleanliness: Keep the shock absorbers and surrounding suspension components clean from dirt, salt, and debris, which can accelerate wear.
• Bushings: Inspect the rubber bushings at the mounting points for cracks or excessive wear. Worn bushings can lead to noise and reduced performance.
• Alignment: Ensure your vehicle's wheel alignment is checked regularly, especially after replacing suspension components, to prevent uneven tire wear and maintain proper handling.
• Professional Check-ups: Have your suspension system professionally inspected during routine vehicle maintenance.

Troubleshooting

If you experience issues with your suspension after installing the Monroe Load Adjusting Shock Absorbers, consider these common troubleshooting steps:

• Excessive Bouncing or Rough Ride: This could indicate worn shock absorbers or an issue with the coil spring. Ensure the correct part was installed for your vehicle.
• Vehicle Sagging: If the vehicle still sags significantly under load, verify that the load does not exceed the shock absorber's capacity or the vehicle's overall suspension limits. Re-check installation for proper seating of components.
• Unusual Noises (Clunking, Squeaking): These noises often point to loose mounting bolts, worn bushings, or improper installation. Re-torque all fasteners and inspect bushings.
• Uneven Ride Height: Ensure both shock absorbers are correctly installed and functioning. Check for any obstructions or damage to the springs.

If troubleshooting does not resolve the issue, consult a certified automotive technician.

Specifications

Warranty and Support

For specific warranty information regarding your Monroe Load Adjusting 58644 Suspension Shock Absorber and Coil Spring Assembly, please refer to the documentation included with your product or visit the official Monroe website. For technical assistance, installation guidance, or to address any product-related concerns, please contact Monroe customer support directly.