Option code Z85 · Suspension & Chassis
Handling/Trailering Suspension
Documented on
- GMT800/GMT900-era trucks
How to confirm it on a real car
GM RPO records factory equipment on the Service Parts Identification (SPID) label in the glovebox. Stickers go missing and cars get modified, so the ground truth for any specific VIN is the factory build record: every option code the car was born with, including Z85 if it was ordered.
Was Z85 on your car's original build?
The CarWhere build sheet decodes any GM VIN into its full factory record — every option code, the original paint, trim and equipment, as built. $9.99, instant.
Independent reference; not affiliated with GM RPO. Applicability varies by market and model year.