Ed,List,
I agree that the GM rear uses less horsepower than the Ford 9". The reason
is also what makes the ford rear the choice of drag racers. The GM rear is a
spiral bevel while the Ford 9" is a deep hypoid rear which has more tooth
contact between the ring and pinion. More contact area means more strength
and more wiping action which equals more friction. For what it's worth, Ford
no longer services the 2.47 to 1 ring and pinion for the 9" but many are
available in late 70's and early 80's full size Ford and Mercury cars. Just
another amateur comment.
Howard
--- Original Message -----
From: "Ed Van Scoy" <edvs@uswest.net>
To: "John Beckett" <landspeedracer@email.msn.com>
Cc: "Ken Bond" <kmb2@humboldt.edu>; <land-speed@autox.team.net>
Sent: Sunday, November 12, 2000 7:36 PM
Subject: Re: Ford 9" / posi / floating, etc.
> Years ago I called Doc Jeffries and spent some time visiting with him on
this
> very subject. His comment RE the 9 inch was that it ate up too much HP for
his
> tastes. He replaced the IRS in his Vette with a Chevy 10 Bolt which he
> considered more efficient - enough to overcome the advantage of endless
gears
> available for 9". Given Doc & Beachball's success with this car (now
> Moore-Stansbury) I am not in any position to argue his choice. The choice
of
> gear ratios available to you with the IRS is pretty slim - I have yet to
find a
> combination that works to my satisfaction. Joe has the answer: a
quick-change.
> Unfortunately SCTA wont let us use it in GT (I want to retain the option
of
> changing from GT to MS and back easily) What is the opinion of this
learned body
> on the merits of 9" vs 10 or 12 bolt in regards to energy loss?
> Ed
>
>
>
> John Beckett wrote:
>
> > Ken
> >
> > Why not run a spool??
> >
> > Are you talking about 3's for the 1st gear in the T-10?
> >
> > John Beckett
> >
> > ----- Original Message -----
> > From: "Ken Bond" <kmb2@humboldt.edu>
> > To: <land-speed@autox.team.net>
> > Sent: Sunday, November 12, 2000 6:35 PM
> > Subject: Ford 9" / posi / floating, etc.
> >
> > > Folks,
> > >
> > > We have decided to put a Ford 9" under the rear of the 85 Vette for
> > running
> > > in D/GT... I am not quite sure HOW yet, but we are committed to going
> > there.
> > >
> > > I have an option to buy EITHER a posi unit or a non-posi unit from a
guy
> > in
> > > Portland, OR that has a couple of both available (both are 28 spline).
I
> > > am assuming that I DEFINITELY WANT the POSI unit. Is there any reason
> > that
> > > logic is faulty?
> > >
> > > Should I be concerned about full / semi floating in this application?
> > >
> > > Also, since I expect to be running a T-10 trans, I am looking at a
couple
> > > of starting' gear ratio sets in the low 3's. Do they seem
reasonable.
> > >
> > > thanks as always
> > >
> > > KEN
> > >
> > >
> > >
> > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> > > * Ken Bond, *
> > > * Prof. of Bus. Admin. *
> > > * Humboldt State Univ. ____________ *
> > > * Arcata, CA 95521 _______| 58 85 99 |_________ *
> > > * / How much horsepower / *
> > > * / Can I have and still / *
> > > * Wk.:707.826.4277 /_________ go to Heaven?______/ *
> > > * Wk Fax:707.826.6666 |_61______61_| *
> > > * Hm.:707.826.7764 I Never Drive Faster than *
> > > * Hm Fax:707.826.0334 My Guardian Angel Can Fly *
> > > * Internet: *
> > > * kmb2@humboldt.edu (office) *
> > > * ragtops@humboldt1.com (home) *
> > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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