my 89 525i wont engage 1st gear..fluids fine..nothing smoking...fluid levels great. color correct in fluid appearance..reverse works..no funny noises from rear end..car just wont drive..starts just fine..everything else works great..just had front and back brakes done..whats wrong and how much will it cost??..thanks for the help, any and all help.. its my only car..there is no back up..and my 1st BMW..:disappoin