I recently converted my 3 speed transmition to a four speed stock fj40 transmition. I kept the 3 speed transfer case. I truthfully was able to drive it for the first time just recently. After working on it for almost a year it was awesome. My only question is this is my first fj40 and I have never driven any other one besides my own and when I drive my and I let off the gas to me the noise that come from the transmition doesn't soind natural. It doesn't grind or anything but it definetly has a loose metal sound. Is this normal ?