[Mgs] Determining the diff ratio

[fogbro1 at comcast.net]

List, 



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". 



Ed Woods