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Old 09-06-2007, 09:01 PM   #1 (permalink)
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Ford Nine Inch Terms

I've been looking on e-bay for a Detroit Locker for my 9 inch. Some state that they fit an 'H' case only, others say that they fit a 'B' carrier. Can any of you tell me what these terms mean?

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Old 09-06-2007, 09:14 PM   #2 (permalink)
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Re: Ford Nine Inch Terms

Rick , I don't know nuthun much about the 9 inch but did you see this post ?
http://www.fordmuscleforums.comall...ferential.html
After reading it and checking out Richmonds web sight I may go this way for my Ranchero .
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Old 09-07-2007, 02:48 PM   #3 (permalink)
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Re: Ford Nine Inch Terms

I'm not positive, but I think that refers to the Ford SVO / Motorsports part # for cases. M4141A, M4141H, etc. There are several carrier bearing sizes, factory units were 2.968" or 3.0625". Aftermarket only has 3.25" bearings for 35 or 40 spline axles. I believe the diffs for the factory centers will swap with a bearing change, but units for the big aftermarket bearings won't work in the smaller cases.

Found a parts list with the motorsport ID's. The Ford part # is the M4141*

IT4641 Differential & Driveline Rear Axle Carrier 9” Nodular Iron 4130 Steel 424.95 M4141A 3.0625” Brg. cap ID. 28/31/33T axle shaft compatiblity.

IT4642 Differential & Driveline Rear Axle Carrier Nodular iron approx weight 26# 374.95 M4141B 2.9687” Brg. cap ID. 28/31/33T axle shaft compatiblity.

IT4643 Differential & Driveline Rear Axle Carrier Nodular Iron approx weight 33# 424.95 M4141C 3.250” Brg. cap ID. 35/40T axle shaft compatiblity.

IT4644 Differential & Driveline Rear Axle Carrier 9” Aluminum 424.95 M4141D 3.0625” Brg. cap ID. 28/31/33T axle shaft compatiblity.

IT4645 Differential & Driveline Rear Axle Carrier 9” Nodular Iron 4130 Steel 374.95 M4141E 3.0625” Brg. cap ID. 28/31/33T axle shaft compatiblity.

IT4646 Differential & Driveline Rear Axle Carrier 9” Nodular Iron approx wt 26# 374.95 M4141H 3.250” Brg. cap ID. Used with Detroit Locker

IT4647 Differential & Driveline Rear Axle Carrier 9” Nodular Iron 449.95 M4141J 2.9528” Bearing cap ID. 31T axle shaft compatiblity. Heavy duty.
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Old 09-07-2007, 03:41 PM   #4 (permalink)
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Re: Ford Nine Inch Terms

My guess is they are talking about the casting number on the case.


Notice this WAR case has a dran plug?
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Old 09-08-2007, 09:56 PM   #5 (permalink)
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Re: Ford Nine Inch Terms

odd, my WAR case doesnt have a drain plug. Ended up with a housing without a plug either ... I got nice luck huh?
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Old 09-09-2007, 03:20 AM   #6 (permalink)
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Re: Ford Nine Inch Terms

The only thing I can think of is that you might mean the "N" case, being for nodular iron. The "N" is a rather large embossed marking in the ribbing above the pinion.
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Old 09-09-2007, 03:48 AM   #7 (permalink)
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Re: Ford Nine Inch Terms

Kevinstang's Ford Nine Inch Differential Page +
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Old 09-09-2007, 06:34 PM   #8 (permalink)
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Re: Ford Nine Inch Terms

Most of the used Detroit lockers on ebay are from circle track race teams. This is direct from one of the auction listings;

"CASE SIZES......H-case lockers will fit a case with a 3.250" bearing seat. B-case lockers will fit a case with a 2.891" bearing seat. B-case is factory standard. To use an H-case locker you need an after market case with a 3.250" bearing seat."
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Old 09-24-2008, 10:55 AM   #9 (permalink)
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Re: Ford Nine Inch Terms

Quote:
Originally Posted by danv View Post
The only thing I can think of is that you might mean the "N" case, being for nodular iron. The "N" is a rather large embossed marking in the ribbing above the pinion.
Not ALL "N" center sections had the infamous cast-in "N" prior to 1969...or '66...can't

remember...anyway ALL of 'em DID have 31-spline centers & axles...like

mine...
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Old 09-24-2008, 11:38 AM   #10 (permalink)
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Re: Ford Nine Inch Terms

I think H cases are for Nascar aftermarket rears I could be wonrg but was looking into this as well.
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Old 09-24-2008, 12:13 PM   #11 (permalink)
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Re: Ford Nine Inch Terms

Quote:
Originally Posted by QuicknDirty View Post
Most of the used Detroit lockers on ebay are from circle track race teams. This is direct from one of the auction listings;

"CASE SIZES......H-case lockers will fit a case with a 3.250" bearing seat. B-case lockers will fit a case with a 2.891" bearing seat. B-case is factory standard. To use an H-case locker you need an after market case with a 3.250" bearing seat."
+1..
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