Identify this diff ratio?

[mollythemoggie]

Hi I was just wondering the best way to identify what ratio a diff is I have.. It has the numbers aya7010 stamped on the saddle things with 126 on one of them and 109 on the other

Thanks very much!

[irmscher]

Count the teeth on the crown wheel and pinion.

[mollythemoggie]

Thanks! Its a 4.2!

[RobThomas]

Are you sure it is a Morris Diff? Looks like cast iron and the "AYA" code is unusual.

[philthehill]

May be Morris but not a Minor one.

[RobThomas]

ATA7034 on the main bearing caps, normally, isn't it?

[philthehill]

Diff details

Rob
Yes ATA7034 and alloy bearing caps.

https://www.ebay.co.uk/itm/MOWOG-REAR-D ... :rk:1:pf:0

Also note the position of the diff ratio 9/38 on the diff nose in the link above.

[RobThomas]

Some AYA codes on the 1800 Landcrab, if that helps. I don't know much about RWD Austins of that period.

[tomb1963]

Diff details

Rob
Yes ATA7034 and alloy bearing caps.

https://www.ebay.co.uk/itm/MOWOG-REAR-D ... :rk:1:pf:0

Also note the position of the diff ratio 9/38 on the diff nose in the link above.

I'm interested in the attachment for different reasons: above the information for the diff part no.s is a table related to tyre size and possibly Dunlop wheel part no.s: is it possible to publish this table in its entirety?