The search function on GM's part website seems broken, I just went to the fluids by category. A regular 75w90 gl-4 might work fine given the official TREMEC fluid has a different viscosity, but I'd just use DexIII equivalent or even OEM since GM is the one on the hook for the warranty. I got a while yet before I do the change but this is one fluid you dont want to screw up.  
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'23 2SS, 6 speed, NPP, Copper-free brakes, 56V Carbon Flash Rims, Riverside Blue
1LE sway bars
EOS front splitter
5-6-22:1100,
7-19-22: 3000,
8-3-22: TPW 8/15/22,
10-4-22: ETA 10/13/2022
10-15-22 6000
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