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Author
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Topic: 9" vs. 9-38" rear end
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DidgeyTrucker
Gearhead Posts: 1631
From: Greenbrier, TN USA
Registered: Oct 99
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posted 01-28-2006 11:26 PM
   
I swear I saw a 9-3/8" carrier in a 9" housing the other day. Can that be right? It was in a '67-'72 F-100. The carrier had the curved rib on the top.Tracy
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427Fastback
Gearhead Posts: 383
From: N.Vancouver.B.C
Registered: Jan 2005
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posted 01-28-2006 11:35 PM
Never seen it done before but....I heard you just have to notch the housing alittle on the top and bottom to get the carrier to slide in..I cannot verify this tho...Cory ------------------
68 Fastback 427MR 4 spd.Deluxe interior,8000 tach,140 speedo,am/fm,tilt.
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clevelandstyle
Gearhead Posts: 1309
From: central Indiana
Registered: Jul 2001
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posted 01-29-2006 02:05 AM
Yup! I've done it before. Notch the housing a bit on top and bottom and the chunk will go right in. ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 408C 4V, 10.50 127 MPH
Prowler Purple '87 T'bird Turbo Coupe
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427Fastback
Gearhead Posts: 383
From: N.Vancouver.B.C
Registered: Jan 2005
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posted 01-29-2006 03:39 AM
There ya go...........confirmedCory ------------------
68 Fastback 427MR 4 spd.Deluxe interior,8000 tach,140 speedo,am/fm,tilt.
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DidgeyTrucker
Gearhead Posts: 1631
From: Greenbrier, TN USA
Registered: Oct 99
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posted 01-29-2006 12:09 PM
I wonder why it was done? They needed a gear and the 9-3/8 was handy? Any benefits?Tracy
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clevelandstyle
Gearhead Posts: 1309
From: central Indiana
Registered: Jul 2001
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posted 01-29-2006 05:28 PM
I donb't know why Ford produced the 9 3/8 rear. It is probably a bit stronger just because it is bulky. The only reason I put one in a 9" housing was because I got it for next to nothing and I need a gear for my truck. It was a no brainer. ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 408C 4V, 10.50 127 MPH
Prowler Purple '87 T'bird Turbo Coupe
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Rory McNeil
Gearhead Posts: 1687
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 01-29-2006 06:17 PM
I don`t know what Fords rationale was for making the 9 3/8s rear end, but it is not as strong as a 9". The diff case has a huge hole in the front for the pinion bearing retainer, possibly for the large diameter pinion gears that tall "freeway" ratio`s have. This large hole make the case weaker, in my opinion. Every 9 3/8" diff that I have seen has been a 31 spline with 2.80 or 3.00 gears, usually with a clutch style limited slip.
I remember years ago, seeing a magazine article showing a 9 3/8" rear in a 10 second car. First attempt with the 9 3/8" ended up with the pinion gear sitting on the starting line!!  ------------------
78 Fairmont 428 4 speed [email protected] 1.32 60 foot
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA M/Stock 302 5speed. [email protected] 1.63 60 foot
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd
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TomP
Gearhead Posts: 6120
From: Delta BC Canada
Registered: Dec 99
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posted 01-31-2006 01:02 AM
That 9 3/8" may be stock... i've got a 3.50 TractionLok 9 3/8 third member that came in a 67-72 pickup housing. Apparently over a certain GVW a half ton used 31 splines and a 9 3/8.
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