The numbers are GM part numbers for a rear air lift shock absorber, with GM 19368463 being a primary part number that replaces the other numbers. These shocks are used in vehicles like the Cadillac Escalade, Chevrolet Suburban, Chevrolet Tahoe, and GMC Yukon from the 2007-2014 model years and are designed to work with the suspension's automatic leveling system.

Part Number Identification 07/2025:
This is the current and primary part number for the rear air lift shock absorber:
GM 19368463

These are older or superseded part numbers that are replaced by GM 19368463:
GM 23487284
GM 23487282
GM 25979394

Vehicle Fitment:
These parts fit various GM and Cadillac models, including: Cadillac Escalade, Chevrolet Suburban 1500, Chevrolet Tahoe, and GMC Yukon XL.

Function:
These are air-assisted shock absorbers designed for the rear of vehicles equipped with an automatic leveling control system (identified as Z55-auto lvlg cnt). They help to absorb road inputs and dampen suspension movement while maintaining ride height.


Z55 refers to rear suspension only
For GM vehicles (Tahoe, Suburban, Yukon, Escalade) with RPO code Z55 Autoride,



OEM part #s include 15886465, 15911938, 15939374, 19353945, 19353949, and 25888675.

Common Part Numbers & Manufacturers (Front Z55 Struts)

Arnott: SK-3062

ACDelco/GM OEM: 15886465, 15911938, 15939374, 19353945, 19353949, 20810270, 25888675

Suncore: 151G-30-4-ASSY (Conversion kit with bypass)

Monroe: Often used for auto ride-compatible struts

Other/Aftermarket: 139104, 139105, 189105




What's the difference between Z55 and Z95 suspension

The primary difference between Z55 and Z95 suspension systems on GM vehicles is the technology used to adjust dampening: Z55 (Autoride) uses electronic shocks to adjust stiffness based on road conditions, while Z95 (MagneRide) uses advanced, real-time magnetic dampers. Both are premium, active systems, but Z95 offers more precise control.

Z55 Suspension (Autoride):
Technology: Electronic shocks and struts that adapt to road conditions to adjust firmness automatically.
Features: Often includes a load-leveling feature for better stability while towing or carrying heavy loads.
Application: Commonly found on Tahoe, Suburban, Yukon, and Escalade models as an electronic comfort/handling enhancement.

Z95 Suspension (MagneRide):
Technology: Magnetorheological damper system, which uses magnetic fluid to change damping rates in real-time.
Features: Often considered a superior, more advanced, and responsive ride compared to traditional electronic shocks.
Application: Found on higher-end GM models, providing enhanced luxury and performance handling.

Key Differences:
Response Speed: Z95 (MagneRide) generally reacts faster to changing road conditions than Z55.

Parts Interchangeability: Components (shocks/struts) are not interchangeable, and mixing them can cause suspension error messages.

Repair Cost: While both are expensive to maintain, magnetic systems (Z95) can have higher repair costs, although they are generally considered more reliable over the long term, notes Vigor Air Ride.

It is important to check the Service Parts Identification sticker in the glove box to confirm whether a vehicle has Z55, Z95, or another system, as suggested by GM.

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