Re: Tire ???
30's should be fine with the t-bar crank and add-a-leaves, you would be in your best interest to do those things first instead of slappin on the 30's then seeing what needs to be done. As far as power and gears, you should be just fine. I have 31's on my blazer with stock gears, and it is still pretty quick for an SUV, I have 3.42 gears, I have also done a few performance mods (K&N Gen II, Dynomax exhaust) but nothing huge, I ran 30's on my sonoma for a while, and it did just fine with the stock 4.3
"There's no pressure on me when I'm in a race car. Hell, that's when I'm relaxed; that's the best time in my life" Dale Earnhardt 9/7/1987