Hello everyone I'm new to forums. I have a 2001 f250 I work on my own trucks. This is my second 7.3. Both have the zf5 6 speed manual transmissions. I just replaced the high pressure oil pump and then my rear end went out. I replaced it with a brand new 1995 ring and pin. So now my problem is a grinding sound/ winning whistle from the top of my transmission!! Please help me fix Frankenstein!!