ok thanks for the info I have seem some threads on other site about 3.73 and 31s

 

I have a chance to buy some. But my buddy and I aren't see if they'll fit because they're off of his 99 and my blazer is a 96. Anyone know of they will work?

 

They should fit I dont see why not

 

Stock tires should be around 29" (235/70 or 75). Running a taller gear like a 3:73 will work into the equation of keeping a stock mileage, acceleration etc pretty well. I have 32's with 3:42 gears & for the street they're uhhh OK. Nothing crazy off the line but I care more for highway mileage & towing on the highway so the 3:32's fit well even thou they're 3" taller than stock.
At 30 - 50 mph I step on it & I'll pass you, no worries - off the line the 3:32's will get the jump on me, no doubt.
Speaking stock wise of course, I'm not taking into factor the chit I have done. Just the general physics of 3:73 compared to 3:42 gears.