I'll try to run some numbers and come up with a gear set for you early next week. This week's been crazy, and I have about 3 days of stuff to get done tomorrow.
My dad pulls 6000lb limited light superstock in kentucky tennessee ohio and indiana. And runs about 45mph wheel speed and 24-26mph ground speed around 1/2 track.
Anyone ever put a spicer cm-5252 in place of the factory o/u in a oliver? Is there a lighter 3-5speed ? I know profab ans scs make one but on a buget for now