I have to start by saying my 2003 Pathfinder has been rocked solid since I bought it. No bad shifts, everything perfect for years, until yesterday.
While driving down a highway around ~70 MPH at about halfway during my trip, my RPMs randomly shoot up. So I slow down and pull over to the side. There seems to be some audible noise when accelerating, but it goes away if I turn overdrive off.
I finish the drive with overdrive off.
I now notice that first gear shifts at 4000-4500 RPM and reverse doesn't work whatsoever, in addition to overdrive not working as mentioned earlier. I'm hearing a slight rattling when overdrive is enabled and i'm driving in first gear. Other gears don't make any noise.
Anyone experiencing anything like this before? Any ideas on what part of transmission would/could affect this 3 things (overdrive, reverse, high shift in first gear) at once?
Thanks in advance.