Z71 is the RPO code for GM’s off-road package. It is not a trim level, not an engine, and not a badge on its own — it is a bundle of parts, and the bundle changed with every generation.
That is why the answer to “what does Z71 include” depends entirely on what year your truck is. Below is what GM’s own documents say.
What Z71 includes, by generation
| Generation | Years | What the factory documents list | Source |
|---|---|---|---|
| T1XX | 2019–2026 | Off-road suspension, (JHD) Hill Descent Control, (NZZ) skid plates, (K47) heavy-duty air cleaner, and a Z71 hard badge. On 2023 it also requires 4WD, the (Z82) Trailering Package and all-terrain or mud-terrain tyres, and brings (G80) locking differential and an (NQH) two-speed transfer case. | 2021 Silverado 5W4, 2023 Silverado SSV, 2026 Silverado 9C1 guides — all three word-for-word |
| K2XX | 2014–2018 | Not documented in a source we hold. GM’s fleet and police guides for these years do not offer Z71, and the retail kits are image scans. | — |
| GMT900 | 2007–2013 | Recorded only as “off-road chassis package”. Component list not documented. | 2007 Chevrolet Silverado Classic Truck Restoration Kit |
| GMT800 | 1999–2006 | Recorded only as “off-road chassis package”. Component list not documented. | 2000 Chevrolet C/K & Silverado Truck Restoration Kit |
| GMT400 | 1988–1998 | Recorded only as “off-road chassis package”. Component list not documented. | 1990 Chevrolet Truck Vehicle Information Kit |
Three separate GM documents — a 2021 Special Service catalogue, a 2023 SSV guide and the 2026 Police Pursuit catalogue — describe the modern package in identical words. That is as solid as this gets.
The older rows are blank on purpose. We hold GM documents naming Z71 back to 1990, but those documents record the package by name and do not itemise it, and the archive scans are not machine-readable. We would rather show you a gap than guess at a parts list for your truck.
A note on GM’s own wording
The 2019–2026 documents describe the package as including “(Z71) Off-Road suspension” — the same code, inside itself. GM uses Z71 both for the bundle and for the suspension inside it. That is not a typo, and it is the reason a plain code lookup for Z71 tends to come back sounding circular.
How to check what your truck actually has
Your options are printed on the RPO label, usually in the glove box, sometimes on the inside of the console lid or under the spare.
- Find the label and read the three-character codes.
- Run them through the decoder: decode Z71 for your model year — change the year to yours.
- The codes beside it tell you more than Z71 alone. JHD, NZZ, K47 and NQH on the same label are the package’s parts showing up individually.
If your label has Z71 but not the supporting codes, you have the suspension and badging without the rest — which is common on older trucks and is exactly the kind of thing a decode will show you.
If your label is a QR code
On 2018 and newer trucks the glove box label often carries a QR code instead of the printed list of three-character codes. Scan it with your phone camera, then paste what comes back into a text message or a notes app — phone cameras tend to show it truncated, and pasting it is the easiest way to read the whole thing.
It is not a web link. It is one long comma-separated line: VIN, model year, model, build date, order number, then a group of three-character codes separated by spaces, then the paint code. That group is your RPO list — paste it straight into the RPO decoder.
This is the better label to have. The codes come off it as digital text rather than something read off a faded sticker, so nothing is misread.
What Z71 gets confused with
- Z7X — a two-inch suspension lift with monotube shocks, 2019 onward. A separate, additional package. Z71 is not a lift.
- Z85 — the standard handling and trailering suspension. If your truck has Z85 instead of Z71, you have the on-road suspension, not the off-road one.
- Z82 — the Trailering Package. On 2023 trucks Z71 requires it, which is why the two so often appear together on a label and get mistaken for one option.
- NZZ — the skid plates. They come with Z71, but NZZ also appears on its own.
Sources
- 2021 Silverado Special Service 5W4 catalogue, GM Upfitter
- 2023 Silverado SSV Specification Guide, GM Upfitter
- 2026 Silverado 9C1 Police Pursuit Specification Guide, GM Fleet
- 2007 Chevrolet Silverado Classic Truck Restoration Kit, GM Heritage Archive
- 2000 Chevrolet C/K & Silverado Truck Restoration Kit, GM Heritage Archive
- 1990 Chevrolet Truck Vehicle Information Kit, GM Heritage Archive
Related
- RPO Decoder — read your whole glove box label
- RPO Code Database — look up any code
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