RE: Rear end gear change
You do not want to find out what happens when your gears don't match! I have a 2006 Z71 on 35" swampers so I'm saving to re-gear. Depending on your do-it-yourselfness and tools it isnt to hard but time consuming. Being able to drop both axels and tansmission and transfer case is alot of work if you are doing it on your garage floor but I know for a fact it can be done with a few jack stand and a couple jacks. As money goes I've been qouted 1500 for a total of all labour and parts from my friend who runs a transmission shop. it helps, ALOT, I'm assuming you have stock 3.55 so a 4.10 or 4.57 gear would give way more power to the tires but the shift points and speedo would beed to be re-adjusted. I would suggest just asking a transmission shop and see what they say it never asks to walk in and ask. Hope this helps.
You Break It, You Rebuild It
2006 Silverado 5.3 V8. 7" lift 35" Super Swamper TSLs. No exhaust straight from the cats. K&N Intake.