Need pully info.

I have a 2002 Pitbull which screams and vibrates at 70mph due to low gearing. I have stock 31 front tooth pully and 65 back and want to add three teeth to the front and go up to 34 and possible change the back. Does anyone know if there are clearance problems with a 34 up front and have any experience with this? I don't have time or money to change gearing in trans right now.
I also need pully formulas for determining proper new belt length (teeth) and ratios of anyone knows where I can get this.

Thanks to all those here who do what they do to keep this going and those that contribute!!
 
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