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Identifying Differential
#1
Hey all,

I have a leaky axle seal at the passenger side rear axle flange so I want to replace it, but I want to make sure I get the right ones. I looked online and autorestomod made a video on identifying 9inch and 8inch diffs  https://youtu.be/KYX5t1tLNlU but mine doesn't fit the description or the example they have on the channel.

Figured y'all would probably be able to help me. Also how bad does that weep look? Havent noticed any fluid on the ground from it yet, will get the diff fluid swapped out and new gaskets for it after I find out what diff it is. If this helps my vehicles original axle code is a 6 (3.00:1 ratio), but the original engine was a code H 351 2V, but there's a 429 in it now and the original tranny was a code X FMX Automatic but theres a C6 in it now. 


Here are pics I took this morning of the rear.
[Image: 20200117-065844.jpg]

[Image: 20200117-065841.jpg]

Also heres some pictures with the axle out. There was sludge just on the inside of the axle flange as demonstrated in one picture with my finger. Is that a side effect of fluid being exposed to water and stuff? Should I be more concerned about it? Was going to replace the seals and bearings and get the fluid/gaskets replaced.
[Image: 20191221-144822.jpg]

[Image: 20191221-144847.jpg]

[Image: 20191221-144808.jpg]

[Image: 20191221-144916.jpg]
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#2
I'm not sure I can be of any help, no idea what that is, but first, what year is it and what model?
If it's an H code, it ought to be a 9 inch from what little I know, but it looks nothing like the 9" I have in my 71 M code. Perhaps it a switch out too? Perhaps a truck rear axle or from another car.
Can't find my pictures right now, will post if I find them.
Geoff.
Hope this helps. this is a stock Ford 9" out of my car.
[Image: IMG-1041.jpg]

[Image: IMG-1044-2.jpg]

Geoff.
 I learn something new every day!
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#3
Definitely need more information about your car, year, engine, model, etc.

To me it looks like an early 8", but hard to tell from the pictures. Need to see what it looks like from the front. Does it have a small metal tag under one of the bolts?

This article might help:
http://kevinstang.com/Ninecase.htm



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
[+] 1 user Likes Don C's post
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#4
The 9" has a bump out to clear the ring gear on the back of the housing. That does not look like a 9" to me. Also the fill plug is in the center section on the front left side. Looks like someone just put something in. First year for 9" was 1957.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#5
http://www.kevinstang.com/Ninecase.htm
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#6
Thanks for the links guys. Yeah this thing doesn't match the descriptions of the standard ford 8 and 9 inch rear axles, so unless its some special production run, idk what the previous owner put in. I'll try an see if there's a tag or something on it. I wonder if perhaps its from the same vehicle that the motor and transmission came from. What all ran the 429/460 motor and a C6 transmission? Might be able to narrow it down, though I am aware that both had a long and numerous production run.
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#7
I was helping a friend the other day with his 64 1/2 mustang vert as we were locating drip sources from the drive train while up on a lift. Car had 260 with C4.

The rear end unit in your pic appears identical to his (especially the filler plug in the pumpkin). Could be one of the previous owner's sold the original 9" from your car and installed an early 8" unit.
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#8
Looks like an early 8” to me.

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

https://youtu.be/SoW1fhaFPzY  Burn Out Video. 

[Image: 044.jpg]
[+] 1 user Likes turtle5353's post
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#9
(01-19-2020, 02:03 AM)DarthRevan39 Wrote: Thanks for the links guys. Yeah this thing doesn't match the descriptions of the standard ford 8 and 9 inch rear axles, so unless its some special production run, idk what the previous owner put in. I'll try an see if there's a tag or something on it. I wonder if perhaps its from the same vehicle that the motor and transmission came from. What all ran the 429/460 motor and a C6 transmission? Might be able to narrow it down, though I am aware that both had a long and numerous production run.


Anything with a 429/460 would have had a 9" or larger rear. Your axle appears to be a 65-66 Mustang 8" housing. Large flat on bottom of center section, two dimples with fill plug and tapered tube ends. No strength difference between it or any other 8".


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#10
I thought it looked like the 9” from a 63 Galaxy, like the one shown in the link? They show a 9” with a drain plug and two dimples on either side. Maybe I was looking at the wrong picture? Anyway hopefully you can figure it out. Good luck.

run_horse Run Horse Run!
John 72 Q Code
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