Hi I have a 87' 4X4 Pickup and just recently drove it for the first time today. (Been working to make it drivable for the last month or two) Anyway when driving i noticed a very loud whine or grrrr noise, but this only happens when the clutch is let out. If you are simply sitting with the clutch pushed in then the noise is gone. I was thinking it was either the transfer case or a bearing in the transfer case, or a bearing in the transmission. It shifts just fine so its not the transmission itself. Any idea as to what it would be? Thanks for the replys a bunch!