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MG Midget and Sprite Technical - Diff ID numbers

I have two differentials I'd like to identify. One came with my current '73 midget project and the other came with an axle which I obtained today.

The first one has the following numbers on the crown wheel: ATA 7241-11/41. I believe this to be a 3.7. Am I correct?
The other one has the numbers:ATA 1224-10-39
Can anyone tell me what ratio this is?

Thanks, as always.
Bernie.
b higginson

3.9

Divide the last 2 digits by the previous 2 digits.
Martin

Martian. Thank you. Easy when you know how ain't it?

You already know that you will be forever Martian, thanks to Prop, and strangely, someone was asking about him on the MASC page on Facebook today. Sadly missed, but many of his contributions are still there in the archives.

Bernie.
b higginson

Bernie,

This is the third tread in the last few days that I've been called that and I consider it an honour. I often think of Prop and I miss his input and stirring of the pot.
Martin

This thread was discussed on 23/10/2019

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.