Should I Use a Splined or DD Shaft?

I am a fan of DD.....

biggest reason is cut to length with less waste....plus no additional splines showing because the spline ends only come in 2" segments.

it gets to be a PIA to line up the safety notch on the spline especially in a hard to see tight spot

You can use your factory shaft by simply machining flat sides (DD) on the end.....no adapter needed. Once done the install and any future removal /install is a breeze.

Actually, I can not think of one advantage to a spline over DD.....if you ever pull your factory shaft apart, you will find the safety collapsible part is ....DD (3/4" into 1")

JMHO