Will a 1999 GMC yukon rear end swap out with a 2000 GMC Sierra?

Did you ever find a rear end? ...or any info on what different rear ends would match?

The 99 to 06 models are all the same, in design, except.... they wer built at different plants and slightly different ratios etc. There is a stamp on the pumpkin that has three letters? numbers etc, if you match that to your donor then you are in business, and do you want to swap the whole assembly or just the gears either of which is easy.

I have a 1999 Yukon SLE 4wd and found that there are TWO 10 bolt rear ends for that year. One is a 1999 8.6" and the other is a 1998 8.5". In early 1999 GM had an abundance of '98 rear ends left over and used them in the first runs of the Yukon (mine was made in Feb. of '99 so it has the '98 rear end). The problem is that while 90% of the two rear ends are the same, the carrier bearings, casters and shims are a different size. The earlier "98 is smaller than the '99 even though the carrier is the same. I was trying to put in a new positraction carrier in mine and found that the bearings and other carrier parts were for the later '99 and so were too larger to fit in the differential housing. Happily all you have to do is get a special set of bearings and casters and shims to fit the carrier into the '98 housing. So, no, not all '99-'06 models are the same, if you have an early '99 with the drum brakes (the '98 model) the axle shafts are also shorter than those on later models which had the rear disc brakes.