I have some 70wt. oil that I could put in them (they have 35wt. in them now) and I have the heavy springs! I have after market aluminum threaded shock so adjustments are easy! Thanks for the tip for the turnbuckles! I have run this track before but never hit the big jumps because I did not want to break anything but, I have enough spare parts to build 2 more trucks now!LOL I am going to take some pics this time and maybe some video!