Just did an upgrade and its sweet. A K20 Blazer...actually its a 1983 K5 Blazer with 1979 K20 3/4 ton axles....so is it now a 8379 or a 79 or...? But on with the problem..... Nice 14 bolt in the back and I went over some railroad tracks and BAM /forums/images/icons/shocked.gif 14 bolt hit the tracks. I am running 31s and don't have the space nor funding to go any bigger right now. Is there something that can assist with this 14 bolt and bumps and railroad tracks?