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i have an eaton posi unit that im going to build a rear end around for my 460 88 mustang project. I need some 31 spile axles and i was wondering where i can find some with hopefully 5 lug axles. I dont know what has 28 and what has 31 splines, i have a line on an 88 mark VII rear end but was wondering if the increased width of 1.5 inches on each side would just look horrible and i also have no idea if its 31 spline or not.
 

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The Lincoln axles are definately 28 spline...You can try checkin out the F150's I know they have 31's in em...however not sure about their length.I know the little Ranger left side axles fit the stang rear fine but again I think they are 28's also.
 

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31s are reportedly tough to find. Of course everyone has their opinion, but Moser sells used axles in addition to their new stuff and says that really narrow used 31s are no problem for them to supply. However, stock application 31s are rare. They try and have them in, but they have very few.
 
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