How To Determining Rear Gear Ratio Without Removing Cover

If you have the car or truck in park make sure to put a block in front of the front tire so it dont go any where and then put the car or truck in neutral, make a line on the pinion yoke and onto the rear end with chalk or a grease pencil. Do the same to the tire on the car, so you can see when the tire has rotated exactly one turn. Now count the number of turns of the driveshaft that it takes (use your chalk marks) to make the rear tire turn one complete rotation, on a open differential it takes two full turns to get the differential gear ratio, now you should be able add it all up and calculate your rear gear ratio.

If you enjoy this video, please like and subscribe for more daily content!