Axle splines


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By Lou - 10 Years Ago
Do all Ford 9 inch limited slip differentials use 31 spline axles? I think the unit  is out of a 66 Ford station wagon. I have a bad wheel bearing in my 57  and have a set of 28 spline axles with new bearings on them I would like to use and save some money.
By Vic Correnti - 10 Years Ago

They come with either 31 or 28.
By Lou - 10 Years Ago
Thanks Vic, I guess I'll have to pull the axles and count the splines. 
By MoonShadow - 10 Years Ago
Check this page. K don't know if this works on all 9" rears but it might help. Chuck
http://www.metropartsmarket.com/rearend/measure.html
By Lou - 10 Years Ago
Wow, thanks MoonShadow, big help
By CK - 10 Years Ago
The 28 spline posi is actually stronger as the larger diameter of the 31 spilne axle thins out the carrier bearing area and they tend to break.the clutch hemisphere.
Yet they did make a centre section which housed a larger carrier bearing too.
By pegleg - 10 Years Ago
CK,
    The posi may be stronger, but the axles are not. The idea of the 31, 33, or 35 spline is to increase the diameter of the axle itself. Allows it to transmit more torque without twisting. The additional splines make that interface stronger as well.
        You are correct about the large bearing housing, it is stronger than the small bearing housing for a number of reasons.