Re: 1939 Super 8 pinion seal replacement

Posted by Owen_Dyneto On 2016/11/23 12:05:47

It's in the shop and parts manuals, a feature of the senior (thru 1950 Custom 8) and commercial (thru 1954) car differentials. It's got a idler bearing inside the case which runs on the backside of the ring gear to prevent deflection under load. What you're looking at is the adjustment for same. See Plate 113 of the 48-54 Master Parts List. Whether it was actually served a purpose or was a case of over-engineering is a question. One might suspect the latter as this was the new "senior" car differential replacing (except for the Twelve) the very massively robust "angleset" differential.