I have the ShyJacker 4" lift sitting in my garage with Hyro 7000 Shocks that I am going to install next weekend. I'm going to Rocky Mountain tomorrow to buy Shackles pins and bushings. I had decided on the Greasable shackles and I have seen some other posts where people said anti-inversion are the way to go. What do the anti-inversion shackles do for you? Greasable $24.99, Anti-inversion - $149.99 - Thats a big difference! http://www.rockymountaincruisers.co...D=1076257972.18893/page=store_suspension.html Also Bailey told me to go to NAPA and get some 2 deg brass shims. NAPA says they don't sell them and can't understand why I would want Brass, being a soft metal. Any input on this?