I have shipped 4 of these dampers before. Ship 2 to a box or your in for trouble. Draining the oil not worth the small amount of weight reduction. Your in a high weight class /w or /wo oil. If you ship 4 in one box they may demand you put the dampers on a pallet (higher cost).
Total weight (if memory serves me right) is 50-75 lbs for each pair.
Engine Test Stand Playlist: https://www.youtube.com/playlist?list=PLwoxyUwptUcdqEb-o2ArqyiUaHW0G_C88 restoring my 1968 Firebird 400 HO convertible (Firedawg) 1965 Pontiac Catalina Safari Wagon 389 TriPower (Catwagon) 1999 JD AWS LX Lawn tractor 17hp (my daily driver) 2006 Sequoia 2017 Murano (wife's car) 202? Electric car 203? 68 Firebird /w electric engine 2007 Bayliner 175 runabout /w 3.0L Mercuiser__________________________________________________________