Technical Ford 9" limited slip identification

Trying to identify this 9" ford differential.
It appears to be a limited slip, but it doesn't have the recessed bolts on the clutch cover. Also 3/4" bolt heads.
It tests out as limited slip.
Did ford make a cone style lsd at one time.
I know it isn't a traction lock or a equa lock. Would like to put for sale, but would like to know exactly what it is.

 

Number of teeth on the ring gear and pinion gear?????
Is there an "N" cast into the carrier?????

 

I can't remember the number, but it comes out to 3:00 ratio
No its not a nodular case.

 

A little info here:

http://www.kevinstang.com/Ninecase.htm

 

Thanks. That was a good read, but didn't seem to cover my unit?

 

cross shaft

 

I would get a good light and look down the axle hole on the side with the ring gear bolts and see if it has two sets of splines.

 

Not really much help, but here's a pic of my LSD 4 spider, 9'' head when it was out. Has the 'cone' as yours does, but mine has holes thru for lubrication maybe??

 

No. It isn't a spool as it does have a cross shaft and spider gears.
Also no. Not two sets of splines.
This is all adding up to why I'm confused as to what it is.

 

An open rear can act like a posi if the spiders are gummed up with ****. Or a budget spool was to weld the spiders so they can’t spin, but the 3.00 makes that seem unlikely. Not saying that’s what yours is. Just presenting possible solutions. It doesn’t look like a traction lock or Detroit Locker. Looks like an open carrier.

 

Might be an old Detroit locker, the new ones look different. My cousin had one back in the day that looked like that, he claimed it was a Detroit or no spin. Just maybe.

Bones

 

Detroit Locker has a very loud clunk when the axles are turned at different rates. It is essentially a large ratchet. Easy to identify by that.

 

it's not a detroit locker.

Take it apart.

 

I have been thinking the same possibility,
But the one in question doesn't have a hole in the spool area where you can see the spiders as in the one pictuter here.
This is a pic. Of a open. Every open I have ever seen has this hole.
I have tried 2 24" pipe wrenches on the axles to check to see if it was stuck spider gears.

 

Ring gear retainer bolts are recessed on a posi unit. There are aftermarket internals that will fit/convert a non-posi unit to posi, or mini-spools that lock both sides together. Don't know if it's common for the 9", but it's not uncommon to weld the side/pinion gears together on some rears to make a "Lincoln-Locker".

 

That is a big possibility,
But it doesn't have the hole in the spool piece like in the picture of a open that I posted.

 

I've been buying and selling 9" ford's for 40 years and never have run across one like this. No ring gear bolts are not recessed.

 

I believe it is a 9-3/8", fits in a standard 9" housing, came in some large cars and trucks iirc.

 

The third member will have a rib that curves down if it is a 9&3/8".

 

^^X2^^

 

How about posting casting numbers/codes from the housing and pinion retainer to help narrow down when it was made? Anything like numbers or codes stamped into the gears or other parts? Was there a metal tag with this unit when it was removed from the axle housing?

 

No.
I don't think 9 3/8.
It doesn't have the curve on the horizontal ribs.
And if I remember right, those were also 31 spline axles

 

I'll try to get more numbers tomorrow.
I have no way of crossing them over.
No there is no metal tag on it as usual

 

Where would the date code be located?

 

Found some pictures on ebay of a "Eaton Detroit true trac"
That look like it.
They don't have the recessed ring gear bolt heads.

 

Couple pics of the" Detroit true trac"

 

the tru trac doesn't act like a limited slip, when you are testing it by trying to turn one axle. It only acts like a limited slip when you turn the pinion or ring gear.

and a true trac don't look like the one you pictured, it looks like this



I don't know what that ebay seller is trying to p*** off

 

Thanks for that info