Monroe 66858 Suspension Shock Absorber - Rear

Monroe Magnum Shock Absorber 66858 Overview

The Monroe Magnum Shock Absorber 66858 is designed to provide reliable suspension performance for vehicles requiring durable and precise shock absorption. Engineered with a metal dust shield and loop bushing mounts, this shock absorber supports consistent handling and ride comfort.

• Compressed length: 12 inches
• Travel length: 7.25 inches
• Extended length: 19.25 inches
• Metal dust shield included for protection
• Loop bushing mounts with 11/16" bushing ID and 1.9/16" bushing OAL
• No compressed or extended bumper stops
• Part number: 66858

Magnum Shock Absorber Product Line Details

The Monroe Magnum Shock Absorber line focuses on delivering heavy-duty suspension components suitable for trucks and SUVs that require enhanced durability and control. The Magnum Shock Absorber 66858 is part of this line, offering robust construction and features like metal dust shields to protect against debris and extend service life.

Technical Specifications and Features

This suspension shock absorber features a compressed length of 12 inches and an extended length of 19.25 inches, providing a travel length of 7.25 inches. The metal dust shield helps prevent contamination from dirt and debris, which is critical for maintaining smooth piston movement and shock performance. Both upper and lower mounts use loop bushing mounts with an 11/16" bushing inner diameter and 1.9/16" overall length, ensuring secure attachment and compatibility with specific vehicle suspension setups. The absence of compressed or extended bumper stops indicates this shock absorber is designed for applications where bumpers are not required or are integrated elsewhere in the suspension system.

Common Applications and Problem Solving

• Replaces worn or leaking shock absorbers to restore ride stability
• Improves handling and control on rough or uneven terrain
• Reduces excessive suspension bounce and body roll
• Protects suspension components from dust and debris damage
• Supports vehicles with loop bushing mount suspension designs

Installation Notes and Tips

Ensure compatibility with your vehicle’s suspension system by verifying loop bushing mount dimensions (11/16" ID x 1.9/16" OAL). Properly compress the shock absorber during installation to avoid damage to internal components. Since this part does not include bumper stops, confirm your vehicle’s suspension setup accommodates this configuration. Use appropriate tools to avoid damaging the metal dust shield during installation.

Quality Assurance and Warranty

Monroe manufactures the Magnum Shock Absorber 66858 to meet or exceed OEM standards for durability and performance. While specific warranty details are not provided here, Monroe typically offers limited warranties on their shock absorbers covering defects in materials and workmanship. Refer to Monroe’s official documentation for exact warranty terms.