Ok, i must be losing my mind. From what i hear/read, you can tell the gear ratio by jacking the rear end. turning the wheel a few times, counting the times the driveshaft makes a full turn, and doing the math. When i jacked my 85 and turned the wheel 2 times, the driveshaft only turned 3 and so on. The driveshaft was turning 1.5 times for each wheel revolution, what am i doing wrong? 85 k5 blazer with an old 305....must have more power!