hi all my mate's disco (300 tdi auto) has lost forward drive. reverse is fine but when in drive there is just a whirring sound from gear box, can anyone help or is the auto box knackered???

hi all i'm trying to find a solution for a friend of mine, he has a 94 disco 300tdi. When its been sat for a while the auto box will stick in 1st. At times this will happen for a quite a few miles, then once it has changed the first time, it will change properly from then onwards. He has had the...