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Author Topic:   9 inch center section info

Posts: 318
From: Jefferson City, MO
Registered: Aug 2000

posted 01-13-2003 05:10 PM     Click Here to See the Profile for tomslo   Click Here to Email tomslo     Edit/Delete Message   Reply w/Quote
I am considering a drop to lower gears and have some questions about the different 9 inch center sections.

1) single rib case vs double rib case vs íŽNíŽ for aftermarket aluminum vs aftermarket iron. At what point does the single rib become inadequate or a liablity?
2) Any special requirements in using íŽDaytonaíŽ pinion support or comparable aftermarket support?
3) 3.026 bearing vs 3.25 bearing?
4) What brand ring & pinion do you prefer? Also, what version of their gear(street- pro- drag,etc)

This will be for my cougar, which is already equipped with 31 spline axles. It is basically a weekend warrior that sees th strip about once a month.



2002 F350 4x4, True Blue, v10 Auto, 4.30LS, 35" BFG's
1991 Mustang LX 5.0L, AOD *need to sell*
1970 Cougar, 351C-4v, C6

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Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 01-13-2003 08:46 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote

You don't have to be too concerned.

Richmond's street gears, and a single ribbed case with stock pinion support with good loc-tighted bolts should hold up fine with your 31 splined axles behind your c-6.

I'd rate the single ribbed case and the double ribbed WAR (non-N) case about equal, then the N-case, then the aftermarket iron cases. The Daytona pinion support is a nice addition, but we don't have one of those either.


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Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 01-13-2003 09:49 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
10-4 on Steve's recomendations.

Alex Denysenko
Co-Administrator and Moderator

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Posts: 1605
From: douglasville,ga,usa
Registered: Mar 2001

posted 01-14-2003 07:32 AM     Click Here to See the Profile for ccode67   Click Here to Email ccode67     Edit/Delete Message   Reply w/Quote
Don't use a Richmond gear, I just recently had one go bad, less than 3000 miles, it was setup correctly and was broken in correctly. The guy who set it up has had several Richmond gears go bad, he recommends Motive gears now, has not had a single failure with Motive, rearends are the only thing he does, probably 12 to 20 per week.

I think a few others here have had trouble with them also.

MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package

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Ryan Wilke

Posts: 1501
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 01-14-2003 08:39 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
Originally posted by tomslo:
...questions about the different 9 inch center sections....aftermarket aluminum...vs iron....

Does anyone have an opinion or any experience with the newer aftermarket ALUMINUM carriers, such as Mark Williams?

Specifically, are they rigid/strong enough to "live a long & happy life" in a 3400# door-car behind a Jerico stick-shifted, BBF turning 9"-11" slicks?


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Posts: 4812
From: Delta BC Canada
Registered: Dec 99

posted 01-15-2003 03:40 AM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
I use the #1904 Strange aluminum case in my Fairlane, but its 3150lbs (w/me). I'd go for the thru bolt style Mark Williams or Strange aluminum case if i had to buy another, even though mine has never been a problem. The first ring and pinion , used 4.57 street gears) lasted 150 passes

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