mine was seized solid too.
took the center console out, drilled out the pop rivets that hold the gator on around the high/low lever, undid a few bolts, and took off a circlip, removed the whole top part with the slider in and had to hammer it out with a lump hammer! i gave the rod a bit of a wipe with some wet and dry, slapped a load of grease and oil on it, and its as smooth as silk now..
sounds like hard work, but didn't take very long at all.
CURLY