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Silverado, Sierra & Fullsize Pick-upsThe Silverado & Sierra have been two of the best selling trucks in the US for decades, and is truly proven to be "like a rock".
im not 100% on these trucks but i know on the older ones you can do it like i posted HERE. the reason im not sure about these trucks as i dont know what axle ratios they came with. im mainly posting to get corrected if i am wrong
The easiest way is to check the RPO sticker (on door, door jamb, or glove box etc.). Looks for codes starting with 'G' (for example GU6). Look them up here: GM RPO Lookup
Rpo codes are going to be found in the glove box and that's only good if the glove box sticker is still there, or hasn't been changed and if the rear axle hasn't been swapped