Re: Identifying 1934 Rear Axle Ratio

Posted by Owen_Dyneto On 2009/7/9 10:22:24

Stamped on the flange of the differential housing, about 2/3 of the way around from the pinion. Also they often stamped the actual gear tooth count which you'll have to divide out to get the ratio. Your car (a Super Eight open car, right) probably has a 4.41/1 differential, so you might find the numbers "75-17".

The 5.08 would be 61-12
The 4.07 would be 61-15
The 4.36 would be 61-14
The 4.69 would be 61-13 or 75-16
The 4.06 would be 69-17
The 5.07 would be 71-14

Not all were available in all chassis and body styles.