High Pitch Whine from Rear End

[whittendave]

Just re-geared to 4.88 from 3.21. Just hit 1100 miles on new gears. On my way to work this morning i developed a very high pitch whine coming from the rear end. I have not taken it off road and I did the proper break in cycle on the gears. I was fixing to do my second fluid change this weekend. I am not hearing anything clunking around like a broken piece of metal. Any ideas?

 

[JerryD]

I would get it checked ASAP. Could be any number of things (bearing, backlash, etc) but none good if left alone.

 

[BLACKJKU]

First before driving it much more check the oil level, then take it to did the gears for you have them check it.

 

[JKTimmah]

Too many beans?

Sorry... I couldn't resist!

T

 

[Michael Shatto]

The high pitched whine is because the gears are improperly aligned.

That said, I had a professionally rebuilt differential fail after a couple thousand miles when a pinion bearing failed. It was a new Timkin made in China.