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LOL, NO where in the world did you read that?
It's a wild thought but my 2006 was just updated and it changed alot of how it works from shifting rpm to it removed a miss from the idle . Shifting down holds now to 5000 rpm before it hits 3rd .. 5000 rpm in second gear is 70 mph .
yes the new trucks will get updates/optional (over the air) as gm releases them, on the older trucks like mine and yours it is something that would need to be done via a cable connected to a computer. you likely received all the updates that there ever will be for your year unless there is a recall.
another twist i was never aware of until the past handful of years. some vehicles you wouldn't expect to come with different gear ratios do actually come with different gearing. some vehicles are just tuned slightly different for where thier sold(this one i was never able to verify). vehicles slated to be sold in the rocky mts or similar areas can come with better gearing for the area. some vehicles just do it with tuning bumping pressure and shift points to accommodate the area the car resides(again however never able tp verify the tuning portion).
if this was the case you would be able to have those kinds of things done at the dealer and there would be a sales pitch from your dealer pretty much guaranteed. so... meh probably not.
