Appearance package, premium ride suspension

Years 2003–06, 2026 Models 5 Factory citations 18

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Also described as Chassis and trailering package

Also documented for Cadillac GMC

Documented applications

Avalanche — GMT800 (2002–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Avalanche, p.38.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.37.

Suburban — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2004 Chevrolet Suburban, p.45.

Suburban — T1XX (2021–2027)

2026 Factory-verified

listed in the 2026 body-builder list with its content lines and no package name: electronic limited-slip axle, integrated trailer brake, Magneride chassis package, Hitch View image adjustment, smart trailer integration indicator, side obstacle detection with extended trailer view

GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.11.

Tahoe — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.34.

Tahoe — T1XX (2021–2027)

2026 Factory-verified

listed in the 2026 body-builder list with its content lines and no package name: electronic limited-slip axle, integrated trailer brake, Magneride chassis package, Hitch View image adjustment, smart trailer integration indicator, side obstacle detection with extended trailer view

GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.11.

This page aggregates every documented appearance of Z66 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.