I used the black bushings and lubricated them with whatever grease I had on hand. They were quiet at first, then started to squeak a little, and then finally settled down to being quiet overall. I never hear any noise now.
Replacing bushings turned out to be more benefit than I expected. The first time I started the engine I thought something was wrong because it was so much quieter. It turned out that my cab had been sitting right on top of the transfer case due to collapsed bushings, and now there is air space, so much less drivetrain noise makes it into the cab. It also put my TH350 shifter linkage back into better alignment, so now my neutral safety switch works both in park and neutral.
Bruce