Re: GRS II gearing
Grasshoppa you are thinking now [img]/wwwthreads_images/icons/smile.gif[/img]
If you think about your hypothetical situation in percentage terms, I think we all agree in stock form the Samurai could use a little more gear. Going from stock tires to 31's will be an increase of ~13-15%. The GRS II will increase your gearing by 18%. So your have a net gain in gearing which is what you needed even stock.
As for the top speed thing, I've never had your exact combo-- I'm usually calculating for how slow I can go [img]/wwwthreads_images/icons/wink.gif[/img] But using the formula for mph/gear/tires, I come up with ~3800 rpm @ 70 mph which sounds reasonable, depending on how strong your motor is. I agree that a call to Gary & Rudy at Petroworks is in order.