TennesseeZ,
I think the Sport Package evolved over the years, and started in 1989 with black mirrors. Maybe all the mouldings were optional like in the rest of the truck line.
It would be nice to find some original GM literature where the Sport Package is explained.........like a 1989 showroom brochure, for example.
With a BYP on your sticker, I'd say yours is a Sport.
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2004 Z71 Tahoe 4x4 5.3L (factory white monochrome theme)
1989 Silverado K1500 4x4 5.7L sportside (white monochrome theme)
1967 Belair 2-door-post (project)
1967 Corvette 427/435 coupe (now 502/502
red road warrior)