1990 GMC K-1500 Sierra XC
Loosened the 9mm bolt that clamps the coupler to the shaft out of the
steering box, but wasn't able get the coupler off the steering box shaft.
Tried prying, but the rag joint was absorbing all of the movement.  The
steering shaft wasn't compressing.  I thought all steering shafts were
splined somewhere along the way to allow in and out movement?  There's a
plastic cover over the shaft so it's hard to tell if it is splined
somewhere.  The cover can be moved around but not removed (solid piece).

Tom