I purchased a local 2003 Silverado 2500HD crew cab a weeks ago. The not so rare New England crusty edition.
I enjoyed your thread of fixes and additions to make it neater. Already installed a set of tricolor taillights I had lying around. I am wondering if you have pictures of the diff cover installed. I gotta change the oil, the stuff that came out when I did the rear brakes was a pretty nasty looking milkshake. I bought a Dorman cover with a fill plug but it appears to be for a 11.5 axle, which I don't think will fit. Not sure.