If it's translucent, then the model is set to use alpha as a transparency control, not for reflection. Without knowing more, my guess would be that the author of the repaint edited his/her model to use alpha for reflection, then painted up a reflective paint for that model. Then, when the paint was released, the author forgot to delete the alpha relections. The only place that alpha would work on your particular model would likely be the canopy. Best educated guess for your situation would be to change the alpha on your textures to pure white (255,255,255), except for any textures for the glass canopy.