Maybe go back through the old articles on Arctic Insider and look up what Brian Nelson has done with El-Tigre suspensions? (2010) That might point you to what you need? Also I have had issues with some generic hydraulic replacement shocks that have weak damping. Most likely foreign made. Jim Dimmerman, I think, built a ZRT powered leafer El-Tigre a few years ago and that sled build is mentioned on that site too. Other than that keeping the swing arms swinging and not freezing up, as rust and ice loves to work into there and create havoc, is key as others have said here.