Will it fit thread

GTX JOHN said

Well, I never was aware of the 8 1/4 being narrower than the 8 3/4 in A bodys.
I thought that they were both around 56 1/2 drum to drum.
However, I am a strictly a Drag Racer and not a restorer.
Appreciate the information!
How much narrower is it?

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I don't know how much narrower it is, but I do know from experience that ALL THREE rear axles that were put under A bodies.....the 7 1/4, 8 1/4 and 8 3/4 are all three different lengths. I never wouldda believed it, but they sire are. Ain't that a kick in the head?