Loud whine noise between 50-60km/h from diff/tranny

Rallly

New member
Hey guy's :)

I have a 91 Celica Alltrac. When cold( anything below -3c), I am getting a loud whining noise from either the rear diff or tranny only between 55-65km/h. It eventually goes away once car/fluids are fully warmed up. I changed the rear diff oil with no difference. Any ideas what this could be?
Thanks!
 
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