OE812

The fluid is fine. I own a 99.

I should have mentioned that I have a 2wd pathfinder.

Just hiding from SaKaNa's answer which I don't completely understand. BTW, nice profile photo... There are no ECU codes. Thanks, Jeff

My 99.5 Pathfinder is making a whistling noise eminating from the rear. This happens when coasting at about 22 mph (1200rpm's) with the overdrive on. When coasting at 22mph, pressing the OD button off eliminates the noise. Pressing it on again, the noise is back. Any suggestion? Thanks, Jeff