To add to that info: the 3.73 is 9% shorter than the std 3.42. At 80 mph in 6th, if you're currently @ 1900 rpm, you'll be at 2072 rpm with the 3.73, roughly a 170 rpm increase in this case. You should have better acceleration across the board but two things to keep in mind:
1. 100 mph will no longer be achievable in 3rd; top speed in 3rd will be about 92 mph.
2. Ultimate top speed will be reduced to somewhere between 157 and 160 mph, before fuel cutoff in 5th.
6th will be a more usable gear, but still too tall for any meaningful topend.