Greetings, first time posting, long time lurker, this is a great site by the way. I recently picked up an '03 GMC Sierra 1500HD to replace my '03 Silverado Quadrasteer that was stolen, joy ridden, and ditched. Insurance totaled the truck before the adjuster got past the driver's door... He never saw the sheared rear knuckle. Not like I'm still bitter or anything... Anyhow, I bought the GMC as the price was right and I was pressed for time. I recently discovered that the RPO stickers are missing from the glove box. I'm curious on the rear gears, and I want to know for sure what I have. Anyone know the best way to go about getting that information? As we all know, the free vin decoders only go so far.. I appreciate any help received, and look forward to being a member of the site.