mine has been making noise for years. every time i wheel hard (lots of time spent with the front diff locked) or do some "go fast" stuff it gets a little louder. might be the fluid heating up and loosing viscosity. i don't know. i have been on the same pump/box since i got the truck and it has always been fine. whenever it makes noise, it usually stops after a few more drives. maybe air in the system from extreme angles?
i flushed it probably close to two years ago.
i flushed it probably close to two years ago.