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Old 07-20-2003, 12:27 PM
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Ford 9" - Is it Posi?

Hi all -

Just wondering if there is a way to determine if a rearend is posi without A) Taking it apart B) Installing it and plastering the gas pedal to the floor?

The rearend is out of a '69 Cougar. Not sure of the engine size that was in the Cougar but one would assume V8, possibly big block to justify the 9".

When I spin the yoke, both sides turn in the same direction but neither side is engaged. What I mean by engaged is that I can grab the end of the axel, hold it stationary, and continue to spin the yoke.

Thanks

PS - I found a great link that tells all about 9" rearends, but the only reference to posi is visual determinators while disassembled.

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Old 07-20-2003, 05:56 PM
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Sounds like you have an open rear! turn one axle and see if the other axle turns in the same direction, if it does its posi or locker.
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Old 10-05-2005, 12:51 AM
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yep open

Where's that website?

thanks for info.
x
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Old 10-05-2005, 11:32 AM
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Could you just stomp on the throttle and see what your burnout looks like. Single or dual rubber strips left on road? Just a thought
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Old 10-05-2005, 11:48 AM
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Just something to think about but, I'm not sure that the turning wheel idea is the best method. The clutches in the ford 9"rear-ends are not known for lasting very long, chances are if it is a posi that it will need new clutches. The question would be is if it is a posi and the clutches are worn out does the turning the wheels in same direction still apply or not.
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Old 10-05-2005, 12:09 PM
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ID Tag?

Hi,
I don't suppose there is an ID tag still on there is there?

I know that a lot of mentally-challenged half-wits will snap them off, rather than remove a bolt when they get asked for the tag at the local Ford store...

IF it's still there, it should have something like "WFE-A" or "WDM-J" on the top line.

The bottom line contains the gear ratio, and if it's a limited slip it will have an "L" in the ratio. i.e "350" would be an open diff and "3L50" would be a limited slip.

To my recollection "WFE" was the common posi prefix, and "WDM" was the open diff.

Keep in mind that until YESTERDAY I have been away from Ford for 13 or 14 years. I just accepted a position as Parts Manager at a very small Ford dealer in Central Alberta. I'm thinking "semi-retirement" , but it will be nice to have access to factual information rather than having to say "I think" or "If I recall" again
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Old 10-05-2005, 12:47 PM
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All the given info is correct, except I cannot verify the tag lettering.
The "3 L 50" information is correct. L in the middle means limited slip.

If a Ford "posi" spins with NO friction between axles it is totally fubar and probably clutches alone will not repair it. There is always some drag on the axles when you hold one axle and turn the yoke or other axle.

I bet it is an open.

If you diff housing has a fill plug on the rear you can look into the fill hole at the ring gear bolts and see quite readily if it is a posi. On the posi the bolt heads are recessed into the housing across their inner arc. On an open they are in a totally flat spot.

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

I am not sure but I think you can look into the carrier filler plug also and see the bolts.

This site has good diff info. Go the knowldege section and click on diff, etc, and look at articles.

Where's that great web site??

Last edited by xntrik; 10-08-2005 at 05:38 PM.
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