Many thanks for looking!
Master Overhaul Kit for your 14-Bolt GM rear axle.
Link below to check fitment:
https://www.yukongear.com/shop/yk-gm14t-a
Currently $430 on Summit plus shipping plus taxes:
https://www.summitracing.com/parts/yga-14070
In addition I'm also including a pair of axle flange gaskets and a Raybestos brake flexi hose BH36765.