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Run to Rund · 04-05-2012, 10:48 AM

The only good news is that the car will be a little faster with the 12 bolt than with the 9" due to the steep hypoid angle = drag of the Ford diff.

04-05-2012, 10:48 AM	#9
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 583 Likes: 8 Liked 54 Times in 27 Posts	Re: COPO part #s and a 9" The only good news is that the car will be a little faster with the 12 bolt than with the 9" due to the steep hypoid angle = drag of the Ford diff.