By 3" tires you mean 31,32,33?
Just a typo no biggie but curious as to your tire size.
I wouldnt bother with the regear and this is why:
- You have 4LO if u ever need to get real low.. even with bigger tires 4L is pretty pretty low.
- Yes the tires will slow u down from a roll.. but at any speed other than very low u always have the option of manually shifting down..
- Fuel economy.