how fast has any on been with a 12 bolt ?

[9second80BU]

3%, cheaper, and lighter. Sounds like good reasons to me...esp. for a N/A car

You will lose 3% out of the converter or...climbing the ring gear.
A Salisbury axle "10 bolt 12bolt are not stronger than a 9" ".

The amount of spead in the case underload could be as much as 10MM.

The 9" atleast Had a pininon support.

The bottom line is GM (General Malfunction) was only interested in low cost...as with everything they did.

 

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