what is the difference between chevy Z71, Z66, and Z86? i own a 1996 Z71 and was curious to know the differenc

They’re all option codes for Chevrolet. The Z71 was extremely popular because it is the Off-Road package. Z66 and Z86 cover different appearances and suspension packages. I knew the Z71 and Z86 from working at a dealership a long time ago, but I picked up the Z66 code from looking up option codes on a search engine.

Z71 is the off road suspension package. Z66 is a two wheel drive only package on the Avalanche. Z85 was an appearance only package from Chevrolet.

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