Bob,
I ditched the idea of doing the cable replacement after reading how to.
Might be in the FAQ or I may have seen it in Haynes (don't shoot me).

I successfully resurrected a very sticky and stiff cable by working it a bit manually and then rigging a funnel arrangement to encourage tranny fluid to seep down into the cable as a good and safe lubricant.

If the cable is sticky in the sheath, even if very sticky, this method can work, and I'll rewrite what I did. If it's busted off at the lower end and thus the cable moves without working anything at the lower end, then I think you're in for replacement.
--
DAMHIK: Don't Ask Me How I Know - - - Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 500 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).