jyardgirl---I agree with all above and just want to go one step further with the 35% increase in feel comment. If your 2.73 is "bogging down" your engine at 0-25MPH the feel can be much greater. In fact with enough engine you may have tire spin with the 3.73, if your so inclined to "tee it up at a red light"! Also the improvement can be more than 35% from 0MPH to wherever your engine gets into its torque band.

The "bog down" is where the engine overloads with gas and runs too rich for maximum power. Try nailing it at 25MPH in 2nd and you will get a big bog down. My automatic with a "jacked up" start pulling a 2.73 bogs a little at around 15MPH.

I'm going down the same road right now and have choosen a 3.42 replacement for a 25% improvement. I want to keep the option open of running the interstate at 70MPH open. There are many RPM Speed calculators on the WEB so give it a lot of thought and use a calculator and a tack to run your engine at your proposed highway cruise with the 3.73 (use 2nd gear) to feel where your going with your change. Above 3200 RPM at highway cruise speed gets old quick.
You will also need to change your speedometer gear in your tranny to have it read right after the change.
Good Luck with the change!