Purchased 2001 Yukon XL

I just traded in my 99 Tahoe for a 2001 Yukon XL 4x4 w/ only 43K. Is there a way to tell what features it came with from the factory? Specificly whether or not it has the auto ride suspension and whether or not it has an open rear diff or not?

I think the SPID sticker is in the glove box. It will have a bunch of RPO codes that list the factory installed options.

Here is what the codes mean for 2001 http://gm-trucks.com/home/content/view/13/30/

//2000CAYukon