2WD Z71? 2000 Chevy Silverado LT.?

ok, so im looking under the truck a few days ago, after I bought it, and I notice that it has skid plates... and is an inch shorter than a 4WD ( Old highway tires). But this truck does not have the decals. The previous owner was my uncle so he didn't take off any decals. Is there any way I can check to see if it is a Z71? Don't have the sticker anymore. Is there anywhere under the truck I can look? Thanks.