You just didn't look in the right place. See here:
http://mgaguru.com/mgtech/rearaxle/ra105.htm
Otherwise you did pretty much the right thing, just took the long way
around with the math.
At 11:51 PM 11/2/2011 +0000, Ed Woods <fogbro1@comcast.net> wrote:
>....
>Just to confirm the MGA ratio in my TF, I did the following:
>
>1. Jacked l/r wheel off garage floor, r/r left on floor to prevent
>rotation, gearbox in neutral.
>2. Rotated l/r wheel 10 turns while counting driveshaft bolts as
>they went by. Counted 86.
>3. Divided driveshaft bolts by 4 to get driveshaft revs. 86/4=21.5
>4. Divided driveshaft revs by wheel reves. 21.5/10=2.15
>5. Multiplied by 2. 2.15x2=4.3 (the standard MGA diff ratio.
>
>Apologies to all those who "knew this already", but in searching the
>web to confirm my recollection of this procedure, I found everything
>from "it can't be done" to "divide by 2" and even " take the cover
>off the diff and count teeth".
>....
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