ACDelco 550-171 | Rear Shock Absorber

Part Number
Shock Absorber

Fits: 91-02 Chevrolet C3500HD, 91-02 GMC C3500HD, 97-02 Chevrolet Express 3500, 97-02 GMC Savana 3500

Special Price $143.20 Regular Price $159.11
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Rear Shock Absorber



  • Air Lift Strut Shock; Air Tube Tee; Compressor Tube Fitting; Coil Spring; Lift Support; Heavy Duty Shock; Monotube Air Lift Shock; Gas Strut Cartridge; Monotube Shock; Shock; Air Fill Valve; Spring Assisted Strut Shock; Stabilizer Bar; Stabilizer Bar Bushing; Stabilizer Shaft; Stabilizer Shaft Clamp; Steering Knuckle; Steering Linkage Shock; Strut Mount; Strut Nut; Strut; Yaw Sensor


Body Diameter2
Boot IncludedNO
Coil Over Springs IncludedNo
Compressed Length14.06
Dust ShieldYes
FAQ - A1Yes. Although shocks and struts perform a similar function, they vary greatly in their design. The major difference between shocks and struts is that a strut is a structural part of the vehicles suspension system where a shock is not. A strut is also a crucial part of the vehicles steering system and greatly affects alignment angles.
FAQ - A2Yes. You should have your vehicle aligned if you are replacing your vehicle's struts. However, it is not necessary to get your vehicle aligned when replacing your vehicle's shocks unless there was a previous issue.
FAQ - A3Yes. It is important to choose the correct shock or strut for your vehicle model and year, as well as for the location in the vehicle.
FAQ - Q1Is there a difference between a shock and a strut?
FAQ - Q2Should I have my vehicle aligned after replacing my shocks or struts?
FAQ - Q3Do I need different shocks for front, rear, left, or right applications?
Features & Benefits - B1Helps absorb and dampen road input into your vehicle's suspension
Features & Benefits - B2GM-recommended replacement part for your GM vehicle's original factory component
Features & Benefits - B3Offering the quality, reliability, and durability of GM OE
Features & Benefits - B4Manufactured to GM OE specification for fit, form, and function
Gas ChargedYES
Good Maintenance Practices - S1 B1Ball joints and other suspension components
Good Maintenance Practices - S1 B2Brakes
Good Maintenance Practices - S1 B3Tires
Good Maintenance Practices - S1 HYour vehicle's shocks slowly deteriorate over time, though this wear is normally difficult to detect. Worn shocks can also cause additional wear to other vehicle components, so to maximize your vehicle's ride comfort, it is recommended to inspect your vehicle's shocks every year. Be sure to always refer to your Vehicle Owner's manual for additional vehicle maintenance practices. Potentially affected components include but are not limited to:
Good Maintenance Practices - S2 B1Leaking oil or wetness along the body of the shock or strut
Good Maintenance Practices - S2 B2Broken mounts
Good Maintenance Practices - S2 B3Broken, damaged, or missing mounting hardware
Good Maintenance Practices - S2 B4Dented reservoir tube
Good Maintenance Practices - S2 B5Bent or scratched piston rod
Good Maintenance Practices - S2 B6Cupped tire wear
Good Maintenance Practices - S2 B7Damaged spring seat, spring, and spring isolator
Good Maintenance Practices - S2 HTo inspect your shocks to gauge wear, check for:
Lower Mount TypeEye
Mkt_State_Warranty_CALimited Lifetime Warranty (Parts Only). Please see for more details
Mkt_State_Warranty_USLimited Lifetime Warranty (Parts Only). Please see for more details
Product DescriptionACDelco GM Original Equipment Shock Absorbers are GM-recommended replacements for your vehicle's original components. Shock absorbers help absorb and dampen road input into your vehicle's suspension, helping provide proper feel and control of your vehicle. These original equipment shock absorbers have been manufactured to fit your GM vehicle, providing the same performance, durability and service life you expect from General Motors. ? WARNING: Cancer and Reproductive Harm -
Programming RequiredNO
Shock Absorber Body End Measuring PointCenter Eye
Shock Absorber Rod End Measuring PointCenter Barpin
Signs of Wear & Troubleshooting - S1 B1Vehicle has 'acceleration squat'
Signs of Wear & Troubleshooting - S1 B2Vehicle does not sit level
Signs of Wear & Troubleshooting - S1 B3Vehicle steering pulls
Signs of Wear & Troubleshooting - S2 B1Your ride is harsh, bumpy or shaky
Signs of Wear & Troubleshooting - S2 B2Your vehicle bounces excessively
Signs of Wear & Troubleshooting - S2 B3Your vehicle leans or sways while turning
Signs of Wear & Troubleshooting - S2 B4Your vehicle bottoms out
Signs of Wear & Troubleshooting - S2 HIt could be time to replace your shocks if, when driving on a surface with bumps and/or dips:
Signs of Wear & Troubleshooting - S3 B1You notice fluid leakage from your vehicle's shocks
Signs of Wear & Troubleshooting - S3 B2Your vehicle's shocks have dented or heavily scratched housings or mounts
Signs of Wear & Troubleshooting - S3 HUneven patches of wear on the edges of your tire can be a sign of weak ride control (shocks or struts). This wear, called cupping, appears as scalloped dips around the surface of the tread. Other signs it could be time to replace your shocks or struts include but are not limited to:
Travel Length8.63
Upper Mount TypeBar Pin




  • 1991-2002 Chevrolet C3500HD - Position: Rear
  • 1991-2002 GMC C3500HD - Position: Rear
  • 1997-2002 Chevrolet Express 3500 - Position: Rear
  • 1997-2002 GMC Savana 3500 - Position: Rear
Customer Questions
How often should shock absorbers be replaced?
Shock absorbers should generally be replaced every 50,000 miles or every 5-7 years
How to replace shock absorbers?
To replace shock absorbers, you need to remove the wheel and tire assembly, unbolt the old shock absorber, replace it with a new one, and tighten the bolts. Then, reinstall the wheel and tire, and test the new shocks.
Why do shock absorbers leak?
Shock absorbers can leak due to worn seals, damage to the piston or cylinder, or corrosion from exposure to moisture and road salt.
Can shock absorbers be replaced?
Yes, shock absorbers can be replaced when they start to wear out or fail.
Does AC Delco make Ford parts?
No, AC Delco produces parts primarily for General Motors vehicles and does not make parts specifically for Ford vehicles.
Can I use AC Delco parts to replace OEM parts?
Yes, in most cases AC Delco parts can be used as a replacement for OEM parts. However, it's important to ensure that the parts are compatible with your specific make and model of vehicle.
What AC Delco oil filter do I need?
AC Delco offers a variety of oil filters that are compatible with different makes and models of vehicles. To determine which AC Delco oil filter you need, consult your vehicle's owner's manual or use our online filter lookup tool that matches the make, model, and year of your vehicle.
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