[Bulldog]

Bulldog with a question which I think I know the answer. But would like some feed back. Have developed a rear end noise in the 8.8 comes in about 50 miles per. A whine that goes up and down with speed. Pulled cover and inspected rear. ring and opinion teeth look good depth looks good on gears very little fragments on magnet back lash seems good also . Am thinking it may be opinion bearings does any one have any advise ? Thanks.