ACDelco Gold rear air lift shock absorber 504-511 (88946598) — adjustable 25–200 psi, chrome piston rod

ACDelco Gold 504-511 (88946598) rear air lift shock absorber is an adjustable, vehicle-specific rear shock that adds temporary air-assisted leveling capacity for towing and heavy loads.

This rear air lift shock from ACDelco is built for drivers who need short-term load support and improved handling when hauling trailers, boats, or other heavy cargo. It combines an adjustable air chamber with a durable chromed piston rod and vehicle-specific fitment to help maintain ride height under load, reduce suspension component stress, and lower the chance of bottoming out. The unit is intended for temporary leveling use only and must not be used to exceed the vehicle’s Gross Vehicle Weight Rating (GVWR) or to increase permanent payload.

How does this air lift shock help when towing or hauling?

When you add weight to the rear of a vehicle, the suspension can sag and alignment geometry can change, which affects handling and braking. The adjustable air chamber in the ACDelco Gold 504-511 lets you inflate the shock to restore a level stance and preserve correct suspension angles. That helps stabilize the vehicle during acceleration, cornering, and braking without modifying the factory suspension permanently.

• Adjustable pressure range from 25 to 200 psi to match varying loads.
• Up to 1,100 lbs of temporary leveling capacity per pair for rear load support.
• Helps reduce risk of undercarriage contact and excessive suspension travel.
• Vehicle-specific design for proper fit and reliable operation.

What makes the ACDelco Gold version durable and reliable?

ACDelco designed this specialty shock with corrosion resistance and consistent wear characteristics in mind. The super-finished chromed piston rod improves seal lubrication and offers a smoother surface that resists pitting and corrosion, so the shock maintains consistent damping performance over time. Each unit also undergoes real-world fit and function testing to ensure it installs and performs as intended on approved vehicles.

• Chromed piston rod for corrosion resistance and extended service life.
• Real-world tested to confirm vehicle-specific fitment and function.
• Precision-finished components for reliable, consistent damping.

How do you set and use the adjustable air pressure safely?

Adjust pressure incrementally to match the weight you’re carrying, starting low and increasing until the vehicle returns to a level stance and handling feels stable. Use a quality pressure gauge and follow the vehicle manufacturer’s load limits—do not exceed the vehicle’s GVWR. Because the shocks provide temporary leveling only, deflate them when the extra load is removed to restore normal ride characteristics.

• Inflate within 25–200 psi range to fine-tune ride height and handling.
• Monitor vehicle stance and handling, and avoid exceeding GVWR.
• Deflate after removing the load to revert to factory suspension behavior.

Will these shocks change my vehicle’s payload capacity?

No. The ACDelco Gold 504-511 shocks provide temporary leveling assistance and do not increase a vehicle’s rated payload. They help maintain ride height and handling when carrying extra weight, but vehicle and axle load limits set by the manufacturer still apply. Always adhere to the vehicle’s load ratings and towing guidelines to remain safe and compliant.

• Provides leveling and handling support only; does not increase payload allowance.
• Not to exceed vehicle GVWR or axle ratings when loaded.
• Intended for temporary use during towing or short-term heavy loads.

Who is this for: The ACDelco Gold 504-511 rear air lift shock is suited for owners who occasionally tow trailers or haul heavy rear loads and want a simple, vehicle-specific solution to restore level ride height and improve handling. It’s a good match for boat owners, light-trailer users, and anyone who needs short-term suspension support without permanent modifications. Professional installers and DIYers who follow vehicle load limits and proper inflation procedures will get the best results.

Features:

• Can maintain ride height with up to 1,100 lbs (per pair) of additional temporary leveling capacity to help improve vehicle handling and reduce the risk of undercarriage damage
• Adjustable air pressure to custom tune each individual load weight
• The super finished chromed piston rod provides anti-corrosion support, a more consistent wear surface, proper seal lubrication, and longer product life
• Real-world tested to ensure that the shocks will fit intended vehicles and applications
• Not to exceed vehicle GVWR (Gross Vehicle Weight Rating). Product does not increase payload.
• Fit type: Vehicle Specific