Well if the 3.21 helps with gas mileage then im all for it. I also never tow anything with the truck. But how bad is that hurting my acceleration? And is it even that noticeable to 3.92? And what would it cost to switch to 3.92 or 4.10?

 

$1000 give or take to swap gears. Yes, there is a difference in acceleration. Make sure you add a limited slip when/if you change gears.