It might be HD fluid but its not recommended for use in this vehicle by AMSOIL. It is not formulated for the vehicle you are using it in. You should be using the regular ATF IMO.
Here is the recommended fluids list...
Fluids http://www.amsoil.com/products/transmission/transfluid_rec.aspx
Here is the recommended fluids list...
Fluids http://www.amsoil.com/products/transmission/transfluid_rec.aspx