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Q:

Loud whine in rear end on 2006 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Noticed a leak in rear-end seal, had it replaced. it was low on fluid;1000 miles later, hear a loud whine from rear end- sounds like mud grip tires. Noise is constant and getting louder. Is it as bad as I think?
(1) Answer
It sounds like your rear differential needs some bearing work, possibly even a new gear set. I think the fluid was low enough for a long enough time period that the metal parts were run dry and thus damaged.