As a new owner myself, this post leads me to think I am remiss for not having done any greasing to date (one year and about 3000 miles since purchase). Knowing that we frequently use remotely mounted zircs for hard to reach bearings on pumps, air handlers, etc. at my facility, perhaps this product could be adapted for hard to reach zircs on the GMC: http://greaseextensionhoses.com/