A 9" has a larger ring gear than a 12 bolt, 9" vs. 8.875, not much
difference. The big advantage to the 9" is that you can change the ring and
pinion as a single unit, making gear changes at the track or at home very
simple. The 9" takes more power to turn than a 12 bolt (parasitic loss).
They are great rears, but I would not put a F*** part under my Chevy!!!
Curry or one of the aftermarket mfrs. now offers a 12 bolt with the quick
change setup.
Brian
From: "Dan Mascheck" <[EMAIL PROTECTED]>
Reply-To: The Chevelle Mailing List <Chevelle-list@chevelles.net>
To: "'The Chevelle Mailing List'" <Chevelle-list@chevelles.net>
Subject: RE: [Chevelle-list] Ring and Pinion Auburn vs. Eaton
Date: Sun, 4 Dec 2005 18:49:20 -0600
What makes a Ford 9" so bullet proof? Is it better than a 12 bolt? It must
have some advantage?
Dan Mascheck
_____
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 04, 2005 2:59 PM
To: Chevelle-list@chevelles.net
Subject: Re: [Chevelle-list] Ring and Pinion Auburn vs. Eaton
In a message dated 12/4/2005 3:37:43 P.M. Eastern Standard Time,
[EMAIL PROTECTED] writes:
Hi,
Speaking as someone who has broken many, what usually lets go in them?
Gene
I've had spider gears blow apart, ring gears shear teeth off, pinion gears
shear teeth off. The internals simply can't handle the torque a high
performance engine will produce. Granted aftermarket parts will help
increase the strength, but nothing can replace what a 12 bolt will handle.
For what it costs to buy all the parts and have someone build you a rear,
you can buy a 12 bolt ready to go in a car.
Tom
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