Starting in 2000 when did GM/Chev go from rear drum brakes to discs and back to drums again?

 

I think mid 99 is when they started rear discs,and 2004 wsa the last year on some models.From what i hear 1500 have rear drums but other models have discs.you can get disc in the 1500 model if you get the upgraded tow package.probably cheaper for them to mass produce,at least brake jobs will be easier and cheaper.