To use 4.88's is gonna cost you a bunch of money.
As far as i know the carrier needs machining etc.
4.10's are a factory gear,and would be much cheaper to install and live with.
With 4.88's,you'll get to be on a first name basis with all your local gas stations,as you won't be passing all that many of them by
4.10's with a limited slip,and probably a convertor somewhere around 2800 to 3,000 stall would make a world of differance,compared to stock.
If you can hunt up Darknight on here,i think he has that combo with a 100 horse hit of nitrous,and he's hit the high 13's