Z71 or not?

I just bought a "93 Yukon. Since its a '93 its a 2-door with the 350 and 4x4. I was told that it is the "GT" version and when looking underneath I saw that it had all the skidplate (which I know can be added afterwards VERY easily) and it also had the good ol' blue and yellow shocks which I know the Z71 package comes with. So... is there anyother tell-tale sign that it would be a z71 or not? All emblems and decals are gone from the exterior so it doesnt have the Z71 sticker if it ever did have it. Thank you in advance.

If the RPO sticker is still in the glove box look through the list of codes for "Z71".