Identifying 31 spline axles. - Vintage Mustang Forums
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post #1 of 17 (permalink) Old 08-16-2019, 03:52 PM Thread Starter
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Identifying 31 spline axles.

Hello all! I recently bought a 1959 9" rear end small bearing housing with 31 spline axles. I know that it didn't come like that originally as I have a 1957 rear end small bearing housing with the oem 28 spline axles. This rear end was owned by a dear friend and mentor of mine who passed last year. His wife allowed me to buy it as I wanted it because it was his.

He bought it 20 years ago out of a Mustang salvage yard and it was in a 1964.5 Mustang coupe for $200. It had a original N case, 31 spline axles and a trac lok carrier. It had a 3.50 gear set in it but no brakes on it. For 10 years I looked at that thing sitting on his upper shelf and tried buying it lol. Unfortunately after he passed his nodular third member disappeared. These axles have the three holes in them but also have stamp lettering on them. I'v never seen the lettering on pic of 31 spline axles online and wonder if they're early aftermarket axles or oem ones. Or maybe even shortened and re splined oem 31 spline axles, I will try to upload pictures.

The lettering is 5-D-RH MW on one and the other AJ ?-D-LH MW and it looks like it has the Ford oval too but it's dirty and I haven't cleaned it off yet. The third digit I can't read as it as at one of the holes.

Thank you in advance!
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File Type: jpg 31 spline axle.jpg (474.7 KB, 7 views)
File Type: jpg 31 spline axle #2.jpg (555.1 KB, 8 views)
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post #2 of 17 (permalink) Old 08-16-2019, 04:48 PM
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I do believe the MW identifies them as vintage Mark Williams axles

65 coupe 5.0L/5 speed
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post #3 of 17 (permalink) Old 08-16-2019, 04:58 PM Thread Starter
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Hi, thank you for the quick response. I didn't think of that? I know that most pictures I seen of oem 64-66 mustang axles just have the 3 holes. I will try to upload some more pictures of the whole axle.
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post #4 of 17 (permalink) Old 08-19-2019, 01:00 PM Thread Starter
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I emailed Mark Williams about them to see if was one of their sets. They said that the part numbers don't match. It was worth a try as I was curious to see the age of them. I can't find any information online on the numbers. I cleaned the flange off and can't tell if that is a Ford oval?

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #5 of 17 (permalink) Old 08-19-2019, 02:13 PM
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65SIX,
Congratulations ! You have scored a set of ORIGINAL 65 A/FX Mustang axles. Those were ONLY made for the factory SOHC Mustangs. My research leads me to believe around 100 pair were made in total and there are two versions. That is indeed a Ford logo and the MW has nothing to do with Mark Williams who was not in business in '65. I have two pair of those axles myself. The difference lies in a small "torsion groove" cut behind the splines on the #2 version. These were in all of the Holman Moody built A/FX Mustangs of '65 and the long wheelbase '66 versions. Holman Moody did offer them "over the counter" after '66. They are very high quality steel and were heavily inspected after one failed causing Gas Rhonda to crash at Lions Drag Strip out here in the west. I have run them in my high ten second (1/4 mile) '66 GT350 for over 35 years without issue.
Again , nice find.
Randy
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post #6 of 17 (permalink) Old 08-20-2019, 01:29 AM
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post #7 of 17 (permalink) Old 08-20-2019, 10:42 AM
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No not "exactly" . I am not sure what the epay axles are. The extra bulge of material towards the flange is not like the original axles I own. Plus the "hub" on the end is shorter on the epay set. It is important to remember that ALL Ford parts were built to specific blueprints. The epay seller says he "was told" and that's where it gets murky. Both of my sets came direct from '65/66 factory built A/FX cars 40+ years ago . No guess work as to their origin. I am in NO WAY berating the pair on epay! They are simply "different" than the two versions I have. I have seen the original factory blue print for the '66 version which is a revised '65 part with an additional machining process and it is not designed like the epay version.
Randy

'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
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post #8 of 17 (permalink) Old 08-28-2019, 04:47 PM Thread Starter
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I apologize for being silent on my response. My wife went into the hospital and I had a lot going on with our son. She is home now and on the mend so I just now saw your responses. What are the Holman Moody 65 A/FX Mustang's?

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #9 of 17 (permalink) Old 08-28-2019, 04:49 PM Thread Starter
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I will also get some more pictures of the axles posted. What are the differences in the axle versions?

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #10 of 17 (permalink) Old 08-28-2019, 05:05 PM
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Quote:
Originally Posted by 65SIX View Post
What are the Holman Moody 65 A/FX Mustang's?
Bad Azzz https://www.hemmings.com/blog/2015/0...ds-to-auction/
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post #11 of 17 (permalink) Old 08-29-2019, 08:02 AM Thread Starter
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Oh wow. I didn't know anything about those cars. I'm a history buff in general but not really on Mustangs and the Nascar/drag racing topic. I know the about the Shelby cars etc. These are a piece of Ford Mustang/racing history especially that were really low number cars and I had no clue. I wonder how many are still around? So Holman Moody is right up the road from me as I live close to Charlotte, NC. My friend was a huge Nascar fan and loved Dale Earnhart Sr. He could tell you ever race that guy won and the times he did it in. He would have probably known about those cars and the people who raced but not about the parts of the cars. He was 56 when he passed and he was old school. He would go to swap meets at the raceway every year but he was not a internet person. He was a Chevy guy down to the core but he had several early Mustangs when he was younger so he always keep an eye out for 9 inch rear ends. So in 1999-2003 he lived in Rutherford, NC and in that time he visited a Mustang salvage yard in Greenville, SC. These axles were in a 1959 housing in a 64.5 Mustang that he bought. I do remember what the third member looked like and he said it was an N case with trac lok 3.50 ring and pinion. It looked like a later style case with the extra ribs on it.

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #12 of 17 (permalink) Old 08-29-2019, 08:12 AM
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Interesting read! Seems they should be reunited with one of the original cars...

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post #13 of 17 (permalink) Old 08-29-2019, 09:31 AM Thread Starter
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Here are more pictures.
Attached Images
File Type: jpg 9 inch axle spline.jpg (260.4 KB, 1 views)
File Type: jpg angle spline #2.jpg (235.8 KB, 1 views)
File Type: jpg axle #3.jpg (366.6 KB, 0 views)
File Type: jpg axle #4.jpg (362.7 KB, 1 views)

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #14 of 17 (permalink) Old 08-29-2019, 09:47 AM Thread Starter
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Here is the housing.
Attached Images
File Type: jpg 9 inch rear end.jpg (832.9 KB, 2 views)

1965 coupe 200ci six Carter YFA carb. 2.77 3 speed manual. 7 1/4 with 3.20 gear. Magnaflow custom exhaust. KYB gas adjust shocks. SSBC front disc brake conversion 4 lug, Eaton leaf springs. My 6 wishes it was an 8
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post #15 of 17 (permalink) Old 08-29-2019, 11:17 AM
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65six,
The axles in your picture are the "second" version I mentioned. The small groove next to the splines was added in an effort to allow the axle to "twist" a little there and not break. Car Craft magazine ran an article on this axle style in '66 . I don'r remember the month but the cover was yellow with a red Chevy II ( Dick Harrell IIRC) doing a wheelie . The article read like "axles with a twist" or "new twist on axles" . It details the undercut these axles have and the theory behind them. As I mentioned Holman Moody sold them over the counter "in the day". IIRC ten '65 Mustangs were converted by Holman Moody and one was built by Dearborn Steel Tubing. A few cars still exist and some have been crashed and are lost. IMHO the axles have about the same value as the '67-70 31 spline Mustang axles . As you found out they are not well known. The axle housing does look like a 57-59 full size housing and the 31 spline axle would work in those housings unless it was a wagon or Ranchero which used the larger axle bearings. That housing was a popular swap "in the day" as the "K" code housings were hard to find and expensive at the dealer.
Several aftermarket manufacturers offer "modern" new 31 spline axles in the $300+ range. Many guys don't feel safe with a 53-54 year old axle in their car and buy the modern ones.
Randy

'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler
Ford Experimental parts collector

Last edited by GT350HR; 08-29-2019 at 11:21 AM.
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