I have a 94 nissan hb 2.4 Transmission was rebuilt 6 years ago and I even have all the original bearings it was done at a professional shop. A month ago I drove it without using the clutch 3 miles it was rough slave cylinder went out.  3 days ago I switched to transmission fluid to all  redline mt85 but I didn't have enough to the full mark hole so added some valvoline syncromesh.

Now a bearing sounds like sliding metal in all gears but 5 th. It fairly quiet in nuetral clutch in or out. The metal sliding sound seems to be getting worse each day slightly. I drain the transmission and put in the OEM Nissan fluid it still sounds horrible what do you think is wrong.