9 3/8 third member
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Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
9 3/8 third member
Anyone have any experiance with these 3rd members? I picked one up from a kid that thought it was a 9 inch. The upper horizontal rib bends down on the driver side of the housing. It has 15 pinnion teeth and 42 ring teeth which comes out to 2.8-1 if my math is correct. The member came from a 67 or 68 year model since the pinnion support has a C7AW and everything else is C6AW. I haven't taken it all the way down yet but did split the pinnion support from the 3rd memeber. If anyone has a bit of knowledge please PM with what ever you know. Thanks.
Cargo Master
Joined: Dec 2003
Posts: 2,734
Likes: 38
From: Sunny Florida
The carrier is of it's own. The OD for the ring gear mounting is larger than that of the 9 inch so swapping 9 inch gears on a 9 3/8 carrier will not happen. If I recall the case should look like a WAR case with two verticle ribs. This case is weaker than the stock single rib 9 inch case. The 9 3/8 canbe used in a 9 inch housing if you notch it for the larger dia. ring gear. Other than that they are pretty much worthless.
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Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
I kind of figured that looking for any info on the rear from google. Having a set of 2.8 gears would be nice so I can drive it to and from work though. Luckily I do have an assortment of speedo gears to swap out with it. The 3rd member was sitting in his garage where his dogs shed hair so I have that to deal with but other then that it is decent.
i ain't rite
Joined: Mar 2005
Posts: 65,455
Likes: 5,526
From: Marlboro Mental Hospital.
Originally Posted by RTM
Other than that they are pretty much worthless.
don't say that too loud in the galaxie forums.
people with the 427 and 428 fe engines prize the 9 3/8 center sections, as that is what came with the 7 litre engines.
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Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
Ok where is the measurement taken to determine 9" or 9 3/8" third member? I pulled the unit apart tonight to clean it out of all the dog hair and 90w oil. The gears themselves don't show any wear and even still have the factory assembly paint. I measured across the flat machined surface and came up with a 8 15/16s". Am I in the wrong area to measure? With that measurement I am thinking that it really is a 9" with any earlier casting then the typical '68 and up housings. The outside diameter of the timken bearing p/n 25520 are 3.250.
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Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
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i ain't rite
Joined: Mar 2005
Posts: 65,455
Likes: 5,526
From: Marlboro Mental Hospital.
i have never had a pumpkin style rear apart, so i can not help you with where to measure the ring gear size. sorry.
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Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
Well I guess it is time to go on a trip to my local library to find some more info on this rear end. That is one good thing about a library card. You have access to all the old reference materials.
Posting Guru
Joined: Nov 2003
Posts: 1,230
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From: East Flat Rock NC
airharley
Heres a link to a thread I posted on a long time ago! Hope it will help!
https://www.ford-trucks.com/forums/3...nd-pinion.html
Wally Womack
Heres a link to a thread I posted on a long time ago! Hope it will help!
https://www.ford-trucks.com/forums/3...nd-pinion.html
Wally Womack