how do you know you have a Z51 suspension
look in the trunk for a label with multiple 3 digit codes, the lable is typically stock to the underside of the trunk lid or on the spare tire cover. If you find Z51, you have it. Absense of this on the list means you don't. If thw label is missing, try calling the local Gm dealership parts dept, they may be able to run the bin to see if the code appears.
IF YOU STILL HAVE IT, THE OWNER'S MANUAL SHOULD HAVE THIS INFO.
Not so Denis, the owners manul is applicable to all options and will not have that info.
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