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My Tahoe had original Autoride shocks at the front, and GM shocks from Hummer at the rear when I bought it.
Previous owner tried to switch car from Autoride to Z71, but did it wrong (even coils were original - too soft without pneumatic).
Now I replaced front with KYB Gas-A-Just KG5040 and rear with KYB Gas-A-Just KG54341. These series Rockauto recognized as Increased Handling/Performance group of goods.
Really happy with that choice, especially about the front.
Hummer shocks at the end was good enough, but I lost one (loosen bolt, it just felt on the road literally - boom - and became L-shaped).
So I needed new pair and pick same KYB series.
Oh, sorry, as well mentioned by @Fless - you better check what coils you have at the rear.
Original Autoride coil is left - 16mm bar diam, and it is higher - because of it is softer.
Z71 coil is 17mm bar and shorter but harder.
I already did the KYB Gas-A-Just shocks on my rig and I will be doing the rear springs, Moog 81069, when I do the rear sway bar kits that are on order. I like the new KYB shocks a lot.