[dannobee]

We just went over this in the other thread. Two old racers quibbling about which was is easier, both methods work. One way requires a digital level, one requires guesstimating an angle. I’ll tell you my way. Put a clutch disc on the input shaft and block one axle stub. Carefully note your two starting points (Input shaft and axle stub). Count the number of turns of the clutch disc for exactly one turn of the axle stub. Do the math backward to determine each gear ratio. The assumption is that there are only a few ring and pinions available. Usually either 7:31 or 8:31. You’ll need to multiply your result by 2 because of the differential gears (assuming it’s not an LSD)