Sounds like I have the same problem or something in the like. I was going on the interstate today 70 or 80 MPH and I shifted down from 5th to 4 and it made a slight metallic grinding sound. While on the interstate I shifted a couple more times between 4th and 5th gears. When I got off the interstate not to long after I pushed the clutch petal in and it made the same sound only much worse, but the noise only occurs when I have the clutch pushed in. I have had a simalar problem to this before, once when one of my motor mounts came off and a couple of times when my transmission was loose so I assumed that is what it was, but when I went to tighten the bolts they were all fine. Any suggestions on what exactly might be my problem, sounds like im gonna have to drop my trannie. Clutch was new 20K or so miles ago, but I don't remember what parts are new or not. Its an 87 22R pickup 4x4.
