Here is how I like to pack them full of Mystik JT-6 High Temp grease with the tranny on the bench. When it's installed I remove one speedometer drive bolt and pack my original tool kit grease gun full of Mystik grease and keep pumping it into the housing. I had to repack my gun 12 times to fill the cavity. Some will come out, but it will be lubed for a long time. Mystik JT-6 High Temp is a very sticky grease and I use it for wheel bearings, tie rods, and all the places that need grease. Since it's a translucent red, if it turns brown or black you know it's time to clean and replace the grease.