1967 Differential Identification - Vintage Mustang Forums
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post #1 of 13 (permalink) Old 08-21-2017, 03:57 PM Thread Starter
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1967 Differential Identification

Hi all.

For my project, I'm at a point where I'm just trying to maintain steady progress. I havent been able to dedicate a lot of man hours thus far, but I'm trying yo arrange things so that I can decompose the overall project into achievable chunks.

One of the chunks I'm trying to tackle at the moment is to identify the differential that is on my car. The previous owner said that it is a 9", but what would I need to take photos of in order to confirm? I was under the car on Sunday taking a few photos, but I only thought to take photos of the housing and the external casting numbers. The input shaft has been covered with plastic and I didn't think to pull it off and takr photos. I also didn't take the time to take any measurements.

I'm having trouble getting my photo of the casting numbers to compress well enough for upload, but here is what I can do to describe it.

Looking from the front into the input shaft, on the left (passenger) side at around 10 o'clock on the dial is a casting. there is a single character cast on its own line, but i can't quite make out whether it is a V or an upside down A. It looks mote like an upside down A to me.

Beneath it the casting appears to be
V-9*OV where "*" looks like it is a backwards 5.
Beneath that line is another one that reads what looks like
MO99


Is this enough information to narrow anything down at all?

What would I need to check to definitively identify my diff?

Thanks for any help you can give me.

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
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post #2 of 13 (permalink) Old 08-21-2017, 04:21 PM
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Quick answer is can you put a deep socket and ratchet on all pumpkin bolts?

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post #3 of 13 (permalink) Old 08-21-2017, 04:46 PM Thread Starter
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Quote:
Originally Posted by HoustonGlock View Post
Quick answer is can you put a deep socket and ratchet on all pumpkin bolts?

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...I dunno. I'll have to check tonight

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


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post #4 of 13 (permalink) Old 08-21-2017, 04:53 PM
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Quote:
Originally Posted by HoustonGlock View Post
Quick answer is can you put a deep socket and ratchet on all pumpkin bolts?

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^^^^^
That's your identifier right there.
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post #5 of 13 (permalink) Old 08-21-2017, 05:17 PM
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if these 2 are obscured and a deep socket and extension can't go straight onto them (housing partially covers them) then it's most likely a 9". If not, it's an 8"
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post #6 of 13 (permalink) Old 08-22-2017, 10:19 AM Thread Starter
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I didnt get a chance to make it out to the car last night. The kids were hopped up on sugar and pcp and took way too long to get to bed. Was going to get to it first thing this mornijg before heading into work, but i woke up with a 3 year old's feet shoved into my back trying to push me out of the bed.

I didnt feel at all like getting down on a creeper.

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


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post #7 of 13 (permalink) Old 08-22-2017, 08:28 PM Thread Starter
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...had full access to all of the bolts.

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


Tombstone's Grille Ornament
Alaric is offline  
post #8 of 13 (permalink) Old 08-22-2017, 08:37 PM
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Originally Posted by Alaric View Post
...had full access to all of the bolts.
That makes it an 8" ring and pinion

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post #9 of 13 (permalink) Old 08-23-2017, 05:01 PM Thread Starter
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Originally Posted by HoustonGlock View Post
That makes it an 8" ring and pinion

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So I don't really know much about differentials, and seeing as how I either didnt remember anything about the one that I have or the previous owner didn't accurately describe it, what steps can I take to identify whether or not the diff in my car is an open diff or some other variant?

Without a bolt tag, how would I go about finding its YoM?

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


Tombstone's Grille Ornament
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post #10 of 13 (permalink) Old 08-23-2017, 05:29 PM
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Get one rear wheel off the ground and see if it turns freely. If it does , it's open. An equalock( period '67) limited slip was rare in an 8" diff but they were an option. Unless you are planning on allot of horsepower or drag race use , a well built 8" will do all you need. The axles are the same for an 8" and a 9" in '67.

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post #11 of 13 (permalink) Old 08-23-2017, 06:00 PM Thread Starter
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Originally Posted by GT350HR View Post
Get one rear wheel off the ground and see if it turns freely. If it does , it's open. An equalock( period '67) limited slip was rare in an 8" diff but they were an option. Unless you are planning on allot of horsepower or drag race use , a well built 8" will do all you need. The axles are the same for an 8" and a 9" in '67.
So the check to see if the diff is open rings a bell. I'll check to see if it's open as soon as i can get time to jack up a rear corner.

If it's an open diff, then my other questions aren't very important so I won't get into them unless that wheel stays locked when it gets lifted.

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


Tombstone's Grille Ornament
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post #12 of 13 (permalink) Old 08-24-2017, 08:33 PM Thread Starter
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Open.

80 Muscort- "Wifebeater" (sorry if it offends. I didn't name it)
06 V6 Premium - "Hidalgo" (R.I.P. )
67 C-code Fastback - "Tombstone"

My Mustangs don't get chick names. They get horse names.
When Hugh Hefner dies, will anyone actually believe the ubiquitous eulogy statement: "Well, at least he's in a better place"


Tombstone's Grille Ornament
Alaric is offline  
post #13 of 13 (permalink) Old 08-24-2017, 10:06 PM
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