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It looks like you have the 6T75 Transmission with the following gear ratios;
1st: 4.484
2nd: 2.872
3rd: 1.842
4th: 1.414
5th: 1
6th: 0.742
R: 2.88
Final Drive: 2.77, 3.16, or 3.39.
You most likely have the 2.77:1 final drive (3.6L LY7 265hp engine) vs. the 3.16 or 3.39. The higher ratios are probably on the deluxe package (3.6L LLT 285hp engine).
Either way the gearing looks to be fairly decent. I'm not surprised about the first gear considering this beast weighs so much.
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