Anyone know if all 28 spline 9" posi are interchangeable - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-21-2012, 07:39 AM
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Anyone know if all 28 spline 9" posi are interchangeable

I have an early 59 rancharo 9" in my 63 Fairlane and have access to a 78 LTD II (sport) 9" posi/limited slip rear both 28 spline. Will the posi work???


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Old 09-21-2012, 09:55 AM
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Yes it will. Just be sure that the '78 is actually a 9 inch. You might want to install new clutches in the Traction Lock before you install it. Every one of these that I have disassemlbed had worn out clutches.

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Old 09-21-2012, 04:24 PM
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OK thanks for the info!
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Old 09-21-2012, 09:04 PM
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9 3/8 ford.

Ford made a 9 3/8 rear, most commonly used in lincolns, big fords. one of the reinforcing ribs is curved, hockey stick shaped.
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Old 09-21-2012, 09:26 PM
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Yea, but all of the 9 3/8 rear ends had 31 spline axles. A 9 3/8 chunk will work in a 9 inch housing if you grind a little clearance for the ring gear to pass through.
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