I'm shopping around online for a replacement rear axle and trying to figure out what all vehicles I can pull from without having to see the sticker in the glovebox. I think the G80 rear axle (locking) was done away with the 2003 Yukon Denalis onward, but it was at least available on the 2001 and 2002 models. Does anyone know if it was a standard option during those two years?