View Full Version : What size gears are these?

09-12-2002, 07:03 AM
Can I tell what sizes rear end gears I have. I have a set from a junkyard...but i dont know what they are...2:73, 3:08, 3:27, 3:55. How can i tell which ones they are?

09-12-2002, 07:18 AM
Count the number of teeth on the ring gear and divide it by the number of teeth on the pinion gear. I have a set of 3.73's here and there are 41 ring gear teeth and 11 pinion gear teeth. So 41/11 = 3.7272727 (3.73).

I have also seen the ratio (on Ford gears anyway) stamped into the end of the pinion gear.