Teach me about differentials.

This link is a Ruckstell Dual High transmission.
http://www.fordgarage.com/pages/ruckstelldualhigh.htm

The photo in the previous post 19 looks like an AA truck under/over unit. These are not overdrives but low to high splitter auxiliary units. It has an underdrive and a 1:1 ratio.
https://www.fordbarn.com/forum/showthread.php?t=244077

There are likely other units that give under/over auxiliary action for model As but most are for trucks or model Ts.
This is why I asked.

If it has a planetary gear set then there could be a problem there too. Not enough information can make for a lot of guess work.

There is not much to a rear axle but here is a good link to the Santa Anita As.
http://www.santaanitaas.org/wp-cont...rential-Rear-End-Restoration-Revised-2014.pdf
 
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