Thank you for the replies and suggestions.
This is a project that I am helping my son with. He would prefer a floor shift. We'll get out the tape measure and take some measurements. The pickup transmission doesn't have the little lever by the knob for shifting into reverse so I'm assuming it isn't a crash box.
If it looks like too much of a project, we"ll try solvent.
Is there another product that is similar to Casite Tune-up?
If neither of the above work out, we'll probably try a vacuum assist delete kit.