Changing tires
 

I have a 98 4door and want to run 31 10.5s on stock rim. Does anyone know if I can run them on stock hight?

I had a 98 4door, took 2 inch lift and 2 inch body lift to run 31s

for what it's worth, I ran 31's on my 04 with a shackle and torsion bar adjustment lift on some aftermarket 2wd offset wheels and they STILL rubbed pretty bad even after hammering on the fender and trimming the front valance...

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Everyone's experience varies, but most people need a minimum of 2" of lift to run 31's on a 4 door Blazer. Your best bet in my opinion is to do a 2" body-lift to start, and see where you sit after that. I suggest that simply because it maintains the stock suspension geometry, while getting more room to clear taller tires. After that if you still need more room there are a few different suspension lift options for you to explore. Tons of info on the forum. Good luck!