Vector 1,
I am pretty sure that your car has the Ford Traction lock unit. You can use Red Line
synthetic shock proof gear
oil 75w90 (has friction modifier), or
AMSOIL Series 2000 75w90. If you use a standard rear gear lube you will have to put in the Ford friction modifer additive.
I would call Red LIne or
Amsoil for their recommendation just to make sure you have the right product for the unit.