Check the oil level, any history from when the g-box oil was changed last? I would recomend on a change if no history, to check level start engine put In to N. (make sure car is on flat suface) and check level on dip stick. If oil level and condion are ok sounds like a torque converter fault, As for the wining noise from experice more likely to be gearbox than diff.
Tone
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all over it jaffa style!!!
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