Ford 9 inch rear - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 23 (permalink) Old 12-31-2016, 08:19 AM Thread Starter
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Ford 9 inch rear

I am looking for a posi center chunk to replace the peg leg one in my 64 Galaxie.
I have found one, which is supposed to have 5.67 gear and posi. He says it is likely from a 70's truck.

Are these units desirable, and are they 31 spline? I will be using a 3.89 or 4.10 gear. Does it have a Daytona piece or anything else good?


What is one of these worth?
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1964 Galaxie 500 351C 4 speed
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post #2 of 23 (permalink) Old 12-31-2016, 12:30 PM
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Re: Ford 9 inch rear

The real question is what are you trying to do with it?
For my usage it'd be a borderline useless piece.
For a stock unit that physically just needs a new chunk it would be fine, but there is the possibility the clutches are burned out which essentially makes it an open unit.

could be either 31 or 28 spline.
Highly unlikely that there is a daytona pinion support or anything other than basic stock parts.
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post #3 of 23 (permalink) Old 01-01-2017, 07:43 AM Thread Starter
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Re: Ford 9 inch rear

Thanks. I am just keeping my eyes peeled for a potential 31 spline trak lock center chunk to beef up my rear end in the Galaxie, and maybe end up with 2 center chunks with different gears. Your point is well taken about likely having to rebuild it.


This guy wants $350, so it is not for me.


My basic plan, unless I find a better one, is to have a guy put a Yukon posi unit and 3.89 or 4.10 gears in the rear that is in the car, cost $550 or so all-in. My only concern is the 28 spline axles I have.


Does this sound like a good plan?


Happy New Year!

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post #4 of 23 (permalink) Old 01-01-2017, 08:22 AM
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Re: Ford 9 inch rear

here is a brand new trac loc in 31 spline for comparison:
https://www.summitracing.com/parts/s...cl31/overview/

Here is my thought if you cannot redo the whole rear at once (which would be nice).
Stock 31 spline axles aren't that much stronger than stock 28 spline axles after 50 years none are really awesome for high hp.
On another note, if you *had* to replace the third with a trac loc and keep it 28 spline, well... eventually replacing them with 28 spline aftermarket axles wouldn't be so bad. I'm sure a set of Moser axles would be hard to break (Of course I have no knowledge of your engine's power, or your desire to race with slicks, etc).
Of course if you were making real power racing with sticky tires, I'd think a Trac loc isn't the right unit for the job anyway.


Drew

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post #5 of 23 (permalink) Old 01-01-2017, 10:15 AM
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Re: Ford 9 inch rear

Hello and Happy New Year 462ho,

Recently I had a Ford 9" rear axle made for my Chevrolet Caprice Classic convertible. I was like you initially and wanted to save money and find a used 3rd member with some sort of positraction.

I quickly came to the realization that trying to find an OE 31 spline nodular iron piece was out of the realm of possibility. Mainly because they are pretty rare and when you do find one they are outrageously expensive not to mention as DeepRoots said it would probably need rebuilding anyway.

If you're interested, here's what I learned when trying to piece a 3rd member together. First settle on your axle type (28 or 31 spline). The axle housing I had made came with 31 spline axles so I had to stick to that. Next pick out the differential type (limited slip, locker, etc) I found that the 31 spline axle differential more often than not requires a larger carrier bearing and by default a bigger bore in the 3rd member housing of which is next on picking out. Lastly choose the type of pinion carrier (std or Daytona).

Here's a quick list of how I pieced mine together you might find helpful, or not .

* Differential - Eaton TrueTrac, I went with this because there are no clutch plates (uses spiral locking gears) and I came across a reference saying you will break your gears before you break the differential in the amount of torque it can handle. Another nice benefit is the harder you launch the more it locks both tyres together and conversely in normal driving it acts like an open diff. Plus no special additive, you can run regular diff oil. They offer this diff in 28 or 31 spline.

* 3rd member housing - Went with a Summit unit with the appropriate carrier bearing size (different bore options)

* To save a little money I used the pinion carrier and yoke from a spare galaxie 9" I have around.

For gears I didn't go as steep as you are planning, I ended up buying a 3.25:1 gear set as it's still better than the 2.73:1 gear set the factory 12 bolt still carries. I am also putting an overdrive transmission in as well.

If you like pictures here's a few.



Setting up the new gears.



To help save a few bucks I did use this pinion carrier and yoke from a spare galaxie 9".



This is the difference in carrier bearing for a 28 and 31 spline axle, of which you need the appropriate 3rd member housing to match.



Eaton TrueTrac differential.



The entire assembly.

Good luck on building your 3rd member!
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post #6 of 23 (permalink) Old 01-02-2017, 06:51 AM Thread Starter
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Re: Ford 9 inch rear

Thanks, guys, great advice.


Maybe I can stick with the 28 spline to keep things cheaper for now. Never thought of aftermarket 28 spline axles. My concern is that the engine is a dedicated 351C full roller drag motor, said to produce over 600hp by the guy that originally bought from a deceased drag racer's estate 20 years ago and stored it, not the guy that sold me the car with that motor in it. So it could be accurate, certainly has the parts. Also, has a toploader, which will be tougher on the rear than an auto.


I will not be putting slicks on the car, maybe drag radials at some point. I don't really have any plans to drag race the car formally, just want it to run like a scalded dog.


XL, that it interesting about the Eaton posi. It sounds like it would definitely last. I will check it against the Yukon and see if the guy will use the Eaton. Unfortunately, building rear ends is above my pay grade, so I need to pay someone to do it.

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post #7 of 23 (permalink) Old 01-02-2017, 11:13 AM
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Re: Ford 9 inch rear

Quick peformance is the place you wanna deal with if you do not intend to build the stuff yourself.
Honestly, if you buy every piece for a third member, their ready to drop in already build third is only a franklin or two more.

The custom Moser axles I bought with bearings and studs, etc were only $370.

If you are serious about 600hp and drag radials, you really need to just wait and save up money. Trying to piece together something on the cheap may just break something down the road.
A trac loc in this instance very well might not be the best plan either.

If it was me, with 600hp and slicks/drag radials, I'd be looking at a Strange N case, tru-trac or detroit locker, pinion support, and aftermarket 31 spline axles, even if it meant waiting a year to make the money. 1350 yokes and a new driveshaft built to handle that power is essential as well.

Either way good luck,
Drew
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post #8 of 23 (permalink) Old 01-03-2017, 01:01 PM
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Re: Ford 9 inch rear

462HO, try contacting this fella, he just posted a for sale today:

FordFE.com Classifieds:

Might cut you a deal, I dunno, he didn't list price.

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post #9 of 23 (permalink) Old 01-04-2017, 08:44 AM
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Re: Ford 9 inch rear

With 600 hp and long Galaxie axles , you will break the driver's side 28 spline axle quickly. Aftermarket 31 spline axles will live. The factory Galaxie race cars had to go to 31 splines in '64 to stop breakage. You can pay now or pay to replace later , but you will need to upgrade sooner or later. Breaking an axle can be hazardous to you and your car's health.
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post #10 of 23 (permalink) Old 01-04-2017, 08:04 PM Thread Starter
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Re: Ford 9 inch rear

Thanks. I may need to reconsider going straight to the 31 spline setup. The Moser axles and differential he wants $1,500 OBO, kinda steep. Thanks for the heads up, though.
I'm currently distracted by working on replacing the cam in my Pontiac, so I will have to revisit this.

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post #11 of 23 (permalink) Old 01-05-2017, 07:40 AM
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Re: Ford 9 inch rear

Here you go.

Ford 9 inch new PEM Iron Case Center Section with 31 spline Mini...

Its all you need and cheap

JIM
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post #12 of 23 (permalink) Old 01-05-2017, 08:27 AM
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Re: Ford 9 inch rear

Another source is Quicktime. ( Quick Performance thanks falcofrerd!)

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Last edited by GT350HR; 01-06-2017 at 07:59 AM.
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post #13 of 23 (permalink) Old 01-05-2017, 10:05 AM
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Re: Ford 9 inch rear

$1500 seems steep, but it is $500 less than new, for basically brand new parts. Price out what you think you need, it may surprise you.
the good part, is you really only ever need to do it once.

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post #14 of 23 (permalink) Old 01-05-2017, 04:42 PM
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Re: Ford 9 inch rear

Quote:
Originally Posted by GT350HR View Post
Another source is Quicktime.
I think you mean Quick Performance.
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post #15 of 23 (permalink) Old 01-05-2017, 07:01 PM Thread Starter
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Re: Ford 9 inch rear

How would a Detroit locker or mini spool behave on the street, especially with tons of curves? Is there any difference between the two?

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