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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

axle shaft

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Old Mar 2, 2011 | 07:50 PM
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bob_351
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axle shaft

i have a ford nine inch out of i believe a 67-72 f100. Its 61 or 61 1/4 wide (measured from outside of axle flange to outside of axle flange). Its a 28 spline right now and im hoping to convert it to 31 spline. According to number dummies info 31 splines in this year were always in a special rear with a 9 3/8 ring gear, which isnt something i want to deal with. Sticking with this housing (28 spline at the moment) Can i use the 31 spline axles out of the goofy 9 3/8, pop them into my housing and have a new 31 spline carrier installed. Basically i want to put 31 spline axles and a REGULAR 31 spline carrier (detroit truetrac) into a 67-72 housing. thanks
 
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Old Mar 2, 2011 | 08:50 PM
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The axle lengths were seldomly the same, and the bearing ends (the outter ends) were different. After all if you found a complete 31 spline axle that was exactly the right width then why wouldn't you just swap the whole axle in?

If you want to do this the easiest way is to have a set of axles made; companies like Moser will make a set and ship them to you in any length, spline, housing end and bolt pattern you want; you just have to spec what you need.
 
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Old Mar 2, 2011 | 09:38 PM
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well i dont want to deal with the 9 3/8s ring gear as there are no aftermarket lockers or posi's. The 28 spline rear i looked at does have large bearing ends so i dont see how the axle ends would be different
 
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Old Mar 4, 2011 | 05:59 PM
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seriously? nobody on this forum has tried this? The axle lengths are within 1/8 of an inch of each other and i was hoping somebody had actually tried this before i have axle shafts shipped from the us
 
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