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Old 04-07-2010, 07:10 PM
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9" question

I tried to search for something similar, but it kept kicking my search back saying words too short, so maybe someone here could lend a hand...

Building a 9" and for cost reasons have to use 28 spline axles. Housing/pumpkin/center section I am buying possibly has 31 spline axles(we will find out tomorrow). I also have lined up a mini spool and gear set for 28 spline axles.

My question is, even though rear end comes with 31 spline, because I am switching gears and spool out for 28 stuff will it work? Will I need a different center section as well?

Never built a 9 inch before, so I really appreciate the help.

Josh

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Old 04-07-2010, 07:54 PM
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28 or 31 spline differentials fit in any of the Ford cases. There are 2 different bearing sizes in the 9 inch, but either bearing will fit any of the differentials. The ID of the bearings is the same. Only the OD is different.

If this is a street car the I do not recommend using a spool of any kind. They are dangerous in a street car and should only be used for racing.
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Old 04-08-2010, 06:16 AM
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Thanks for the advice, I will take that into consideration. But the car sees very limited street use anymore. Thanks for the help.
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Old 04-08-2010, 07:38 AM
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Ford9 application info.

http://www.ratechmfg.com/ford9app.htm

There are 3 carrier bearings for the F9. If the diff in the 31spline unit is a regular open diff, the mini spool will work. A mini spool will not go into a posi diff.
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