Rancho RS5000X 0″ Rear Lift Shocks for — US Postal FJ-8A 2WD

Rancho RS5000X 0″ Rear Lift Shocks for US Postal FJ-8A 2WD

Part Number: RS55119

Summary: The Rancho RS5000X series utilizes an innovative cross-tuned twin-tube design to provide a significant upgrade over factory damping for the US Postal FJ-8A. By incorporating a unique progressive engagement valving system, these shocks minimize harshness during initial impacts while maintaining firm control during heavy compression. This Tier 4 shock is engineered for maximum durability and dent resistance, ensuring smooth street comfort and reliable service for utility applications.

Features

• Progressive Engagement Valving: Custom-tuned compression circuitry provides a smoother transition between damping stages to ensure consistent ride quality over varying road surfaces.
• Twin-Tube Gas Pressure: The 2.25-inch reserve tube provides increased fluid capacity to ensure cooler operating temperatures and reduced fade during extended use.
• Nitro-Carburized Piston Rod: A heavy-duty 16mm rod diameter provides superior structural rigidity to ensure long-term seal integrity and corrosion resistance.
• Protective Boot: Included polyvinyl accordion boot provides a physical barrier against road debris to ensure the longevity of the polished chrome rod and oil seals.

Technical Specifications

Fitment

• AM General US Postal FJ-8A 2WD
• Note: Configured for 0″ of rear lift (Stock height). Specifically fits AM General Model FJ-8A.

What’s Included

• Includes 2 Shocks
• Protective Polyvinyl Shock Boots
• Mounting Hardware/Bushings

Why Choose This Product?

• Engineering Advantage: Rancho’s patented “Progressive Engagement Valving” specifically addresses the high-frequency vibrations often found in utility chassis, offering a more refined feel than standard replacement shocks.
• Performance Benefit: The twin-tube design is inherently more resistant to external damage (dents), meaning the internal piston stroke remains unaffected even in harsh work environments.

Related Products

Front Only (Same Series):
Rancho RS5000X 0" Front Lift Shocks for — US Postal FJ-8A 2WD

RS7MT (Front):
Rancho RS7MT 0" Front Lift Shocks for — US Postal FJ-8A 2WD

RS5000X (Kit):
Rancho RS5000X 0" Lift Shocks for — US Postal FJ-8A 2WD

RS90000XL (Front):
Rancho RS90000XL 0" Front Lift Shocks for — US Postal FJ-8A 2WD

RS7MT (Kit):
Rancho RS7MT 0" Lift Shocks for — US Postal FJ-8A 2WD

RS90000XL (Kit):
Rancho RS90000XL 0" Lift Shocks for — US Postal FJ-8A 2WD

Frequently Asked Questions

Will these shocks lift my US Postal FJ-8A?
No, these shocks are configured for a 0-inch lift, meaning they are designed to replace factory-length shocks at standard ride height.

What is the benefit of the RS5000X over a standard twin-tube shock?
The RS5000X features a larger 2.25-inch body and specialized valving that reduces the aeration of shock fluid, providing more consistent damping than entry-level alternatives.

Does this include all necessary mounting hardware?
Yes, these shocks come with the required bushings and sleeves to mount to the L1 and OE-style mounting points on the FJ-8A.