What is your tire size, RBs36? That’s a significant factor here. The “torque plateau” characteristics of the later 235, as mentioned by Jon G/ Jerry, gives you quite a bit of leeway in rear end ratio.
But since you’re swapping rears anyway, might as well try to strike a balance between first gear and OD usability.
I’m not familiar with tires for the 17 inch wheels. I’d assume they are pretty tall.
They are 5.25/5.50-17. Coker shows them at 29.02" diameter.
