I am looking at regearing my 4 banger too. I am running 31" tires. What size are you running? The reason I ask is because when I looked at several charts it looked like the 4.10 was what I needed to go with but you are trying to go down to a 4.88 Isn't stock a 3.70 or something like that? Now I am confused. Disregard the tire size question. I just saw it in your sig.
Brandon Sutter EMT-P
2002 Jeep Wrangler, 65,000 miles, 2" Pro-Comp Lift, 31" All-Terrains, aftermarket front and rear bumpers, tuffy overhead radio lockbox