Have used several methods over the years.
Fuel line on the bottle spout, with a piece of 3/8 steel tube bent at 135° stuck in the fill hole. Make the fuel line long enough so you can hold the bottle upright out from under the car - very similar to Woodchuck's suggestion, but a one man deal.
StaLube 1 gallon bottle with their pump and the 135° bent tube.
Best method was to fill it on the bench.
Regardless, make sure to use GL-4 spec gear lube and only GL-4, Not "GL4/GL5" multispec, GL-4. NAPA carries the StaLube brand, or you can get it on Amazon.
Fuel line on the bottle spout, with a piece of 3/8 steel tube bent at 135° stuck in the fill hole. Make the fuel line long enough so you can hold the bottle upright out from under the car - very similar to Woodchuck's suggestion, but a one man deal.
StaLube 1 gallon bottle with their pump and the 135° bent tube.
Best method was to fill it on the bench.
Regardless, make sure to use GL-4 spec gear lube and only GL-4, Not "GL4/GL5" multispec, GL-4. NAPA carries the StaLube brand, or you can get it on Amazon.