If you are right at 2k at 70MPH then you have the big tow gears. I've had both and the info you have is correct - my non-big tow that I have now runs about 1700-1800 RPM at 70mph, the big tow was right on the money at 2k RPM at 70MPH. If you've got it, that's a good thing even if you don't tow. My other Titan had a little more "oomph" off the line with the bigger gears, definitely enough to be noticeable. In fact, it was the first thing I noticed when I went from big tow to non big-tow.