ring and pinion
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New User
Joined: Jun 2005
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ring and pinion
hello to all ford truck owners ,, i have a 1972 ford f100 4x4 that has , what i've been told a 9 3/8ths set of gears in the rear end the ring gear measures from across the center 5 3/4 and from bolt hole to bolt hole 6 1/2 and the ring gear is alot thicker than a standard 9 inch ,,, my problem is finding a good used or even new set of them without changing anything ,,,,, any help and or advise would be greatly appreciated,,,,,,, thank you
Elder User
Joined: Mar 2004
Posts: 976
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From: SOUTH CAROLINA
the thing about changing just the gears is the rear end gears cant be just bolted in. they have to be set up properly. there are shops that will do this but its usually not cheap. if you have to have new. and you've never done this then have it done by a shop. if you want out cheap look for another center chunk, check them for the same gear set and install it yourself. you could do this in a couple hours. good luck.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
KYdude, Welcome to FTE 
The best truck show on the net.
I fear that you have been given bad advice. Sounds like you have been talking to some air head bowtie owner. There is no such animal as you describe.
For the 1/2 ton 5 lug wheel, Ford mostly used the 9" with a few Dana 44s scattered in. The 9" available in 28 & 31 spline axles was offered across the Ford family. Because of it's ease of swapping it is what Nascar uses today in it's race cars, although highly modified.
The 9" comes with different ratios, that can be swapped in & out of the rear housing as long as the axle spline remains the same.
Ol Kevin has put up a pretty good page on the rear http://www.kevinstang.com/Ninecase.htm Hope you can find something there to put you back on the path.
John
The best truck show on the net.I fear that you have been given bad advice. Sounds like you have been talking to some air head bowtie owner. There is no such animal as you describe.
For the 1/2 ton 5 lug wheel, Ford mostly used the 9" with a few Dana 44s scattered in. The 9" available in 28 & 31 spline axles was offered across the Ford family. Because of it's ease of swapping it is what Nascar uses today in it's race cars, although highly modified.
The 9" comes with different ratios, that can be swapped in & out of the rear housing as long as the axle spline remains the same.
Ol Kevin has put up a pretty good page on the rear http://www.kevinstang.com/Ninecase.htm Hope you can find something there to put you back on the path.
John
Posting Guru
Joined: Nov 2003
Posts: 1,230
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From: East Flat Rock NC
There is an odd 9in that the gears do not work in most 9in cases and if I
remember right its an old lincoln,may be a older thunderbird, but i'm real sure
that its the older lincoln, if I do remember right the gear is like 9 3/4 .
The web page posted above is a very good one heres one also.
http://www.fnc.ch/Technik/9-Inch_rebuild.htm
P.S the thick gear is just a low gear, I think the low thick gears start at about 3.50, I think but not sure that 3.25 is thin,i'm sure that a 3.00 is thin!
And Welcome to (FTE)!
remember right its an old lincoln,may be a older thunderbird, but i'm real sure
that its the older lincoln, if I do remember right the gear is like 9 3/4 .
The web page posted above is a very good one heres one also.
http://www.fnc.ch/Technik/9-Inch_rebuild.htm
P.S the thick gear is just a low gear, I think the low thick gears start at about 3.50, I think but not sure that 3.25 is thin,i'm sure that a 3.00 is thin!
And Welcome to (FTE)!
Last edited by Pro-Street/StateTK; Jun 20, 2005 at 09:21 AM.
Posting Guru
Joined: Nov 2003
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From: East Flat Rock NC
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Posting Guru
Joined: Nov 2003
Posts: 1,230
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From: East Flat Rock NC
Here is another good link for 9 in housings.......
http://dfwmotorsport.com/Fairlane/9inchrearends.htm
if you look down to the line about the 63 to 77 Lincoln,Thunderbirds,and LTD's you will see that they came out with a Ford 9.375 in center.
as you know hogsheads get swapped around all the time as do rearends.
"Who knows what Henry could have done that day"
http://dfwmotorsport.com/Fairlane/9inchrearends.htm
if you look down to the line about the 63 to 77 Lincoln,Thunderbirds,and LTD's you will see that they came out with a Ford 9.375 in center.
as you know hogsheads get swapped around all the time as do rearends.
"Who knows what Henry could have done that day"
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Brett Foote
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Originally Posted by Pro-Street/StateTK
Here is another good link for 9 in housings.......
http://dfwmotorsport.com/Fairlane/9inchrearends.htm
if you look down to the line about the 63 to 77 Lincoln,Thunderbirds,and LTD's you will see that they came out with a Ford 9.375 in center.
as you know hogsheads get swapped around all the time as do rearends.
"Who knows what Henry could have done that day"
http://dfwmotorsport.com/Fairlane/9inchrearends.htm
if you look down to the line about the 63 to 77 Lincoln,Thunderbirds,and LTD's you will see that they came out with a Ford 9.375 in center.
as you know hogsheads get swapped around all the time as do rearends.
"Who knows what Henry could have done that day"
I don't want to get into any kind of peeing contest over the issue. I read these forums everyday, and can't recall anything about this size rear.
Maybe someone else has.
John
Posting Guru
Joined: Nov 2003
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From: East Flat Rock NC
I think that the person that wrote ''but no gears'' on the web site I posted they meant that there are
no after market gears, spools,parts. I would like to know if these hogs heads
fit in a normal rearend housing ,because in the past I have just installed car
hogs heads in trucks and never knew that this could happen. I am in the
middle of going though boxes of magazines and sorting them better, I am looking
for the one I saw this in, I do remember that the front of the housing has a
odd ( web ) across it that sort of waves down on one side.there is a pic in
the magazine that its in.
P.S I did not want to offend any one but any time that we (all) can learn
more it has to make this great site even ( greater )!
no after market gears, spools,parts. I would like to know if these hogs heads
fit in a normal rearend housing ,because in the past I have just installed car
hogs heads in trucks and never knew that this could happen. I am in the
middle of going though boxes of magazines and sorting them better, I am looking
for the one I saw this in, I do remember that the front of the housing has a
odd ( web ) across it that sort of waves down on one side.there is a pic in
the magazine that its in.
P.S I did not want to offend any one but any time that we (all) can learn
more it has to make this great site even ( greater )!
Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
I've read a little about them in researching a couple of things.
Another link explaining their origin and identifying marks:
http://www.hotrod.com/techarticles/48618/index13.html
As Pro-Street said, the right side has a web that sort of veers downward, it's pretty unique. The article I quote up there also states that a 9 3/8" 3rd member will fit in a 9" housing if you notch the housing a little.
Another link explaining their origin and identifying marks:
http://www.hotrod.com/techarticles/48618/index13.html
As Pro-Street said, the right side has a web that sort of veers downward, it's pretty unique. The article I quote up there also states that a 9 3/8" 3rd member will fit in a 9" housing if you notch the housing a little.
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New User
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ok i have almost everything i need to make this truck the standard 9 '' rear end what i'd like to know is can the regular 9'' fit in my 3rd member case or do i need the 9 '' case ,,,,, mine says 9 inch on the tag it has a daytona pinion support with the big bearings on the pinion also can the regular 9'' posi take the bigger bearings so it will fit my support or is a smaller one needed ...... i really appreciate all the advice you guys are giving me and hope to have my truck moving soon ,,, i miss it
Laughing Gas
Joined: Aug 2004
Posts: 964
Likes: 1
From: Roseburg, OR
make sure the axle splines are the same as your rear axles.
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New User
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yes the 9 inch carrier i have is a 31 spline as well ,,, but i still need to find the back plateon the clutch side to make it complete ,, been lookin on ebay nothing yet once i get that peice i should be good to go ,,,, thanks alot guys you've been a great help ,,,, glad i found this forum,,,,,,
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