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Identify this diff ratio?

Posted: Sat Feb 16, 2019 11:37 pm
by 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!

Re: Identify this diff ratio?

Posted: Sat Feb 16, 2019 11:54 pm
by irmscher
Count the teeth on the crown wheel and pinion.

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 12:12 am
by mollythemoggie
Thanks! Its a 4.2!

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 9:07 am
by RobThomas
Are you sure it is a Morris Diff? Looks like cast iron and the "AYA" code is unusual.

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 9:57 am
by philthehill
May be Morris but not a Minor one.

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 10:29 am
by RobThomas
ATA7034 on the main bearing caps, normally, isn't it?

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 12:06 pm
by 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.

Re: Identify this diff ratio?

Posted: Sun Feb 17, 2019 5:04 pm
by RobThomas
Some AYA codes on the 1800 Landcrab, if that helps. I don't know much about RWD Austins of that period.