hi everyone hope you can help i have a p reg discovery tdi and its making a horrible whinning noise also hard to move, asked a garage and they said its either the diff lock or the transmission. talked to a freind and he said it might be theres no oil in the diff lock or transmission and i had to check it from underneath. he lives a long way away and can,t help, when i asked him to show me where to look on his one he just laughed because i,m a woman big help can anyone out there explin so i can look.