[hat_man]

I once rolled the truck until one bolt on the U-joint was at 12 o'clock. I marked it with tape and marked the tire at 6 o'clock. I rolled the truck forward until the tire made one revolution. The tape on the U-joint was at about 9 o'clock. I figured it made 3 whole revolutions and 3/4 of a revolution. That seems to me to be a 3.73 so that's what I always assumed because it matched the tag. Wouldn't a 4.10 have left the tape around the 1 o'clock mark?

Playing with the formula, the only way I can get the 2k rpms with a 3.73 and the same tires would be with a .87 5th gear but I'm almost certain that that gear wasn't available in any Ranger 5 speed manual transmission.