[Alpines] rear axle question

[Bill Mounce]

Hello all,

 

I just read the article in this month's Rootes Review about adding and O/D
unit, and they listed two different rear axle ratios, and the resultant
speeds v. revs.  I always had these questions: how do I know which rear end
I have, and why were there two different ones?  At one point I thought one
went with the O/D trans, the other with non O/D, but that made little sense.
Can anyone 'splain'?

 

Thanks, Merry Christmas & Happy Holidays to all, 

 

Bill Mounce

 

1967 SV