the purpose of the spline is to support the weight of your
head
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It will either be a 28 or 31 spline. I believe that most open
rear ends used 28 spline and the limited slip rear ends used 31
spline.
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spline (= groove) = ranura (noun), ranurar (verb)
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Splines are parallel grooves on the side of a shaft that engage
with matching grooves in a socket. They allow power to be
transmitted between two rotating elements. Splines are used on
axles to allow them to be removed and replaced.