Ok, so i guess first of all i should say that im new here. I recently bought a 1980 K5 which has been giving me a few headaches. When you are going down the freeway or someplace where you can keep a high constant speed, under no load the transfer case makes an icky bad grinding noise. Does tha make sense? Its bad enough that you can feel it through the truck. Oh, i should probably tell you that the truck has a brand new TH350 and NP205 transfer case. Any help would be appreciated.