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How is it that a C1500 5.7L is listed as having a 4-speed auto trans, but a K1500 5.7L gets a 3-speed?
That's not how they tended to be equipped.
See how a 2500 is rated to tow less? Their tow ratings are BS. What year is that from? The GCWR on my 98 K1500 was 10,700. I see no reason it should be any less than what you have in front of you. In stock form though I will concede that 10,700# was a decent limit, north of that and the truck was wallowy and lacked confidence. Totally different story now with bigger springs and brakes. And more power.