Quote:
Originally Posted by jonzcustomshop
thanks guys, the tires right now are 9.00 20's , the pontiacs are not bonnevilles, the hardtop is a ventura ,and the sedan is a star chief ( star chief is the bonneville trim level for sedans in 60)
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Those tires should be a 40" tall tire, which means going to the 19.5's you would see a 23% increase in RPM's
Alternatively you could go with a 245/75R19.5 which will have a 33.6" over all diameter, so a bit taller. That would mean only a 19% increase in RPM's
I'd say that would be a pretty good trade off. It would lower the ride height of the truck 3 1/4" and would allow you to lower the suspension further, you could pull a good 9" of height out of the truck pretty easy that way which would make it much easier to load cars on.