986 driveshaft spline hopelessly stuck

[itsnotanova]

I've removed well over 100 axles. I hit the socket used to loosen the nut with. Back the nut off a little bit and one or two good hits from a big hammer usually knocks it loose. The early boxsters came with a flared nut but later ones came with a nut/attached washer. The washer will become detached using this method but can be reattached with a quick strike of a hammer or pressed together in a vice.