How much wheel spacing should I probably need in the front of my 98 blazer in order to keep from scrubbing the sway bar when I turn?

 

How wide of a tire, and what size rims are you running?

Stock sizes shouldn't rub. If they are, you either have something bent, or need an alignment
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265/35/22

 

What is the backspacing on your rims? That works out to just under 10.50". I'm running 10.50s on my truck, with a 4.5" backspacing, and I have no rub on the frame or sway bar at all. Stock 4wd rims have 6" BS, so it seems like moving the tire out 1.5" does the trick

 

Thanks