Trim group, High Country

Years 2008–09, 2015–27 Models 10 Factory citations 40

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Also described as Package, LZ option 3Equipment group 3LZ (Z06)Equipment group 3LZEquipment group 3LZ, Premier

Documented applications

Corvette — C6 (2005–2013)

2008–2009 Factory-verified

The NICB 2012 manual prints "Z06 Custom 3LZ" in its 2011 column; 2011 is not claimed because no 2011 factory list exists.

GM factory document — 2008 chevrolet corvette rpo code list, p.1.
GM factory document — 2009 chevrolet corvette rpo code list, p.1.

Corvette — C7 (2014–2019)

2015–2019 Factory-verified

only in: Z06; 2017 from the NICB VIN manual; 2016, 2019: from GM order-guide copies (Corvette Action Center; 2019 also GM Authority)

GM factory document — 2015 chevrolet corvette fleet order guide wayback, p.6.
GM factory document — 2018 chevrolet corvette fleet order guide wayback, p.2.

Corvette — C8 (2020–2027)

2023–2027 Factory-verified

only in: Z06, E-Ray, ZR1, ZR1X; Z06 coupe 1YH07 and convertible 1YH67; E-Ray coupe 1YG07 and convertible 1YG67 (2024 guide)

GM factory document — 2023 chevrolet corvette stingray z06 order guide copy corvetteblogger, p.5.
GM factory document — 2024 chevrolet corvette stingray z06 e ray order guide copy corvetteblogger, p.5.
GM factory document — 2024 chevrolet corvette stingray z06 e ray order guide copy corvetteblogger, p.10.
GM factory document — 2025 chevrolet corvette fleet order guide, p.5.
GM factory document — 2026 chevrolet corvette fleet order guide, p.5.
GM factory document — 2027 chevrolet corvette fleet order guide, p.15.

Equinox — Third generation (D2XX) (2018–2024)

2018 Single-source

NICB series Premier (3LZ) NICB 2018 p.168
2019 Factory-verified

FWD and AWD, LH7 diesel

GM factory document — 2019 chevrolet equinox order guide april 6 2018 copy gm authority, p.97.
2020–2021 Disputed

sources conflict: NICB 2020 p.164 and NICB 2021 p.169 print Premier (3LZ), and GM Authority 2021 changes page lists 3LZ as dropped for 2021 (so on sale in 2020), but GM Authority 2020 changes page says 3LZ ended with the diesel after 2019

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide, p.1.

Silverado HD — K2XX (2015–2019)

2017–2019 Factory-verified

the 2016 guides print it only with a footnote digit (3LZ3), so 2016 is not claimed; 2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide

GM factory document — 2017 chevrolet silverado 2500hd order guide revised august 12 2016 copy gm authority, p.1.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.81.
GM factory document — 2019 chevrolet silverado 2500hd order guide april 20 2018 iteration 2 copy gm authority, p.81.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

only in: 2500 HD, 3500 HD; High Country: 4WD Crew Cab CK20*43 (2500 HD) or CK30*43 (3500 HD); 2023 Upfitter list prints "Package" with the option number

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.9.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2025 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2027 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.

Silverado — T1XX (2019–2026)

2022–2026 Factory-verified

trim group printed under the High Country heading of the guides;

GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.9.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.9.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.10.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide, p.1.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide, p.219.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide, p.102.

Suburban — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

the body-builder lists name it LZ option 3

GM factory document — 2025 chevrolet new suburban fleet order guide, p.1.
GM factory document — 2026 chevrolet suburban fleet order guide, p.1.
GM factory document — 2027 chevrolet suburban fleet order guide, p.1.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.9.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.9.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.4.

Tahoe — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

the body-builder lists name it LZ option 3

GM factory document — 2025 chevrolet new tahoe retail and fleet fleet order guide, p.1.
GM factory document — 2026 chevrolet tahoe retail and fleet fleet order guide, p.1.
GM factory document — 2027 chevrolet tahoe retail and fleet fleet order guide, p.1.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.9.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.9.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.4.

This page aggregates every documented appearance of 3LZ in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.