In today’s video, the good folks at Moser Engineering are going to explain axle splines—what they’re for, why they matter, and how to count or measure them.

On the axle shaft, you will see a series of smaller peaks and valleys cut into the end of the shaft, which are designed to mate to the rear differential. Moser has a line of popular C-clip axles with a spline count ranging from 26 splines to 40 splines.

Generally, the more power your engine makes, the higher spline count you need to transfer that power to your wheels effectively. Learn more here: