I have searched the forums and there is a lot on this culprit. Since Dec. My truck has been notchey 2nd to 3rd to 4th. There is no grinding or noise as long I shift slow it is fine just not smooth. I have checked the slave cylinder the best I can since it is sealed there is 2 tabs 1 on each side of the cylinder that move in when the clutch is pressed. They never move back. The clutch is releasing. The truck has 115,000 now. I tow a 10,000 lb camper and never had a problem. That liquid gold has been in it about 5000 miles. When I changed it there was no metal flakes in the oil just black. One thing I did notice when I changed it in Nov the part # was different and the oil was thiner than when I changed it before but the bottle said for NV4500 Whata yea think pilot bearing or syncros. Either way I can't stand this much longer.