Gabriel Fleetline 85045 Heavy Duty Rear Shock Absorber - Fleet

In this review of the Gabriel Fleetline 85045 rear shock absorber, the bottom line is clear: this is a purpose-built replacement for heavy-duty trailers and commercial trucks that need a durable, OEM-fit shock to restore ride control. It is best suited for fleet mechanics and owners of Hendrickson, Ingersoll, Ridewell, SAF Holland and similar trailer suspensions who want a direct-replacement shock with a 4.4' stroke and a compact collapsed length. The single biggest reason to buy is the FleetLine engineering that targets commercial service environments, offering heavy-duty valving and an exact upper and lower ES36 mount fit for many trailer axle assemblies.

Key Features

• Direct fitment: Designed to match common OEM mounts ES36 upper and ES36 lower so installation is straightforward on compatible Hendrickson and other trailer suspensions.
• Heavy-duty design: FleetLine valving and construction are intended to withstand demanding commercial use across box trucks, trailers and utility fleets.
• Precise dimensions: With a 14.52' extended length and 10.12' collapsed length plus a 4.4' stroke, it restores proper suspension travel on specified ride heights.
• Wide vehicle coverage: Listed fitment includes Hendrickson Intraax variants, Cush Corporation, Ridewell, SAF Holland and multiple trailer models, reducing the need to source multiple part numbers.
• Interchangeable part numbers: Cross-references many OEM numbers such as 70213501, B23651 and SA5045 for easy identification when replacing original shocks.

Who It's For

The Gabriel Fleetline 85045 is aimed at fleet service centers, trailer owners and maintenance crews who need a heavy-duty, direct-replacement rear shock for Hendrickson, Ingersoll, Ridewell and SAF Holland air-ride and standard axle applications. It suits vehicles with the specified ride heights and mount types where restoring ride control and reducing suspension wear is the priority.

Operators who expect long-term abuse in extreme off-road conditions or who have previously experienced early leakage with low-cost shocks should evaluate warranty and return options; some customers report durability concerns under exceptionally harsh service. Light-duty passenger projects and applications without ES36 mounts should look for model-specific shocks instead.

Pros & Cons

Pros

• Good OEM-style fit and straightforward installation on compatible trailer suspensions.
• Heavy-duty valving and construction designed for commercial fleet use.
• Improves ride quality and handles road irregularities better than many original units.

Cons

• Some users report durability issues and oil leakage on a minority of units in very heavy service.

Specifications

Our Verdict

The Gabriel Fleetline 85045 is a sensible choice for fleet operators and trailer owners who need a direct-replacement heavy-duty rear shock with accurate OEM mounts and solid ride improvement. It delivers good fit and value for most commercial use, though buyers should be aware of isolated reports of early leakage under extreme conditions and consider installation environments when evaluating long-term durability.

Frequently Asked Questions

Will this shock fit Hendrickson Intraax axles?
Yes, the 85045 lists fitment for many Hendrickson Intraax variants when the ride height and mount style match the shock specifications.

What are the mount codes for this shock?
The shock uses ES36 for both the upper and lower mount locations.

Is this suitable for utility trailers and flatbeds?
Yes, it is specified for a wide range of trailers including utility, flatbed and drop deck models from manufacturers such as Wabash and Utility Trailer when the listed ride height and mounts apply.