5-door said:You might find this hard to believe, but a Ford 9" is lighter than a 12-bolt. It's even lighter than a 10-bolt.
I'm not sure if I would buy that or not. If that were true, then why would some NHRA Super Stockers and Comp eliminator cars run a 12 bolt (I've seen dragsters with GM 12 bolts...I've even seen Mopar S/S cars with GM 12 bolts. I guess it could also be less parasitic loss due to the pinion to ring gear position. But a stock 9" with an iron center section, I'm pretty darn sure the 9" is heavier than a 12 bolt.
Not having weighed either side-by-side myself, I surely could be mistaken though.