you're crazy...there's a HUGE difference between 3.23's and 3.73's...I had 3.23's in my last truck (ECSB) and then went to 4.10's. Huge difference. My new truck has 3.73's and there is little to no difference between my 4.10's and my 3.73'sAssuming you have 3.23's, you won't notice much of a difference jumping up to 3.73s. To get your money out of re-gearing, you should do 4.10s.
I'm not quite sure why you want to swap gears though... since it's just your daily driver. It's kind of an expensive mod. :think:
There cant be a "Huge Difference"... its math.. the numbers are decently close... now I will tell you what a huge difference is... Try going from 37's with stock 3.73's up to a 5.13 Gear! Now there is a "Huge Difference!" Thats what i just experienced... Now I can burn my 37" toyos - both of them - for about 3 feet on dry pavement... and before? Well, nothing, you see.... 1st gear used to run all the way to 54 mph untill it shifted to second at redline! Now its about 35! Thats a "Huge Difference!"