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  Topic Review (Newest First)
01-10-2010 07:30 PM
hotelconucc93 I had an axle with a tag saying 3.07 on the front when I got the jeep and I popped it open and it was 3.07!

I did a spin on the rear and calculated 3.73 but the darn tag said 3.07. Popped the cover and it was an aftermarket pinion gear with 3.73.

Since then, when I buy axles at yards, I ignore all tags and pop covers and read the rings.

The guys are saying read the ring gear. It will not always just say 3.07 3.73 or 4.1 on it. It will say something like "41 10", or 41 ring gear teeth and 10 pinion gear teeth, or 41/10 = 4.10. Or.."41 11"...41/11 = 3.73...etc
01-10-2010 02:18 PM
postaldave Jack up the rear end. Count driveshaft revolutions while rotating the tire. Turn the tire 2 complete rotations if your other tire remains stationary and does not rotate. Turn the tire 1 complete rotation if the other tire turns in the same direction. The number of times the driveshaft rotates equals the gear ratio. If the driveshaft rotates about 3x, the gear ratio is 3.07. If it rotates 3 3/4 turns, the gear ratio is 3.73. You can mark the driveshaft to help you count.

tape a string onto the driveshaft if you want to make it fool proof
01-10-2010 01:55 PM
Why J? There are numbers etched into th ring gear it self. I believe they are after the part number, it wil lbe a number - number. Divide the first number by the second and that is your ratio.
01-10-2010 01:49 PM
Fhajad Why don't you just spin the wheel and count the drive shaft turns?

It's kind of easy.
01-10-2010 01:47 PM
Howiedooit I believe it's the other way around, ring/pinion= ratio
08-14-2006 08:44 PM
TSEJEEPERS divide the number of teeth in the pinion gear by the number of teeth in the ring gear.
08-14-2006 08:39 PM
YJscott2
how to tell gear ratio by the ring gear

how can you tell the gear ratio by the ring gear. can u multiply the nubers or what
im goin to pick up a front end and the guy dosnt know what gears it has.

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