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4000 quattro whines

omebody please help me!!!!

My '86 4kq is whining under load, if I ler off the gas it goes away,
the harder I accelerate the louder it whines, once up to 70mph it 
practically is gone. Most noticable in 5th between 40-55mph.
Please tell me carrier bearing or something else. Should I try
the gear oil and hope for the best??? 
Which kind? Castrol 80W90? 80W140? Hypoy C?


Rich Andrews