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  #1 (permalink)  
Old 10-11-2009, 08:20 PM
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Ford 9 Inch Posi Swap

Hey guys. I have two Ford 3rd members. One is a 28 spline posi with the axle bearings (earlier posi?) under the caps. The other is a 28 spline non-posi out of a newer Ford Van I believe that has the non-roller axle bearing seals under the caps? What I want to know will a Ford 9 inch (28 or 31 spline posi unit) interchange with any year of Ford 9 inch 28 or 31 spline non posi unit?

I want to purchase this posi unit http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWAX:IT and put it in the newer Ford Van rear end that I have that currently has the "sealed looking" (not the roller bearings as pictured in the Ebay listing) part under the caps.

If it helps any, the axles out of the newer Ford Van 9 inch are 28 spline and when I tried to put them into the older posi unit I have that is also 28 spline, it just wobbled around in there so I assume the newer 28 spline axels are a smaller in diameter than the older 28 spline axels. Will the newer style axels fit in an older style posi unit like the one I have linked to the ebay listing?

I hope this makes sense. I just want to know if an older posi with the roller bearings (like what is on the Ebay listing) will fit in a newer Ford 9 inch case and visa versa. Thanks. Brent

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Old 10-12-2009, 09:53 PM
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Anyone have any information they can share?
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Old 10-12-2009, 10:00 PM
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What you are asking is very confusing. On the carrier, all of them have roller bearings, and no seals. Now on the axle bearings there are several types, ball and roller, seal, no seal, ect. But the important part to the carrier, they are either 28 spline, or 31 spline. If the 28 spline axle just flops around in the carrier, then it's a 31 spline carrier, and won't interchange.
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Old 10-13-2009, 03:55 AM
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Quote:
Originally Posted by 31fordcoupe
Anyone have any information they can share?
Anything you want to know here. >> http://www.kevinstang.com/Ninecase.htm or here http://www.maliburacing.com/ford_9_i..._nine_inch.htm
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Old 10-13-2009, 09:43 AM
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All the 28 spline axle's are the same diameter.You can also put 28 spline side gears in a 31 spline carrier.You can also put 31 spline side gears in a 28 spline carrier IF you bore out the hole that the axle slide's thru.

If you thinking of buying a used Trac Loc,make sure there are no cracks around or in between the ring gear bolt's. If that posi needs clutch's,a clutch kit is around $60.00.
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Old 10-18-2009, 10:58 PM
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Thanks SSedan and prostreet,

I had looked over kevinstangs sight repeatedly prior to posting. I just couldn't decipher an answer to my question there though. Prostreet answered my question as usual. Thanks.
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Old 11-04-2009, 07:26 AM
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Hey 31fordcoupe...

...i'm the FNG here...1st post...but I do NOT understand whst the !@#$%^
you mean by "axle bearing seals under the caps"...

Could you explain THAT part to me...maybe I might be able to help...seeing
as how I'm in the middle of rebuildin' a late 60's-1970 9" assembly for my for my '56 Effie...

I picked mine up used...was "told" it got pulled out of a '70 F100 but ya know how that crap goes...turns out it's a LARGE tube (3.25") big axle bearing (3.15" o.d.) with 28-splines BUT...my center section has the smaller Carrier Bearing measuring 2.891"...
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Old 11-04-2009, 05:27 PM
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rockher_man ,

Hotrodders.com is a PG site...Just an FYI for you: no profanity or "masked" profanity will be used here. Thanks
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Old 11-04-2009, 06:25 PM
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Please define "Newer Ford Van".

Ford hasn't installed a 9" diff in anything newer than about 1982.
To my knowledge, it was used in Full-sized Broncos (U150), 1/2 ton pickups (F150), and 1/2 ton vans (E150)
Subsequent models used an 8.8" integral carrier.


Almost every pickup truck had 31-spline large diameter axle shafts as well.
28-spline ones were more common on passenger cars.
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Old 11-05-2009, 07:40 AM
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OOOpps...

[IMG]
Quote:
Originally Posted by Crosley
rockher_man ,

Hotrodders.com is a PG site...Just an FYI for you: no profanity or "masked" profanity will be used here. Thanks
Sorry...I'll keep a lid on it...thanks for the heads up...

Back to the "wobble" issue...

The F100 pickup used 9" rears AFTER the demise of the Spicer/Dana44...
...AND also used 28-spline axles...

Even HIPO cars like 390c.i. Fairlane GT's had 28-spline axle shafts!

OEM shafts are all equal.

28's taper and cannot be shortened.
31's are the same diameter flange-to-spline.

I'm glad you got you question answered 'cause I'm still tryin' to figure
out exactly what the trouble is with that rear assembly...

Anyway...here is the difference between big bearing and small bearing AXLE bearing...

You can see the axle tube flanges here...
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Old 11-05-2009, 10:16 AM
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Quote:
Originally Posted by rockher_man
[IMG]

Sorry...I'll keep a lid on it...thanks for the heads up...

Back to the "wobble" issue...

The F100 pickup used 9" rears AFTER the demise of the Spicer/Dana44...
...AND also used 28-spline axles...

Even HIPO cars like 390c.i. Fairlane GT's had 28-spline axle shafts!

OEM shafts are all equal.

28's taper and cannot be shortened.
31's are the same diameter flange-to-spline.



I'm glad you got you question answered 'cause I'm still tryin' to figure
out exactly what the trouble is with that rear assembly...

Anyway...here is the difference between big bearing and small bearing AXLE bearing...

You can see the axle tube flanges here...
Dana 44 rear's in the F100 are 30 spline axle's.
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Old 11-06-2009, 09:38 AM
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oops...

...got me on that one before I could make it back...
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