Body Parts have different alpha from Body

Hello,

I am trying to recreate a very low poly model of Boo from Luigi’s Mansion for the game engine. My texture has an alpha of 130 which is (about) half in the program I use for image editing. The problem is that the arms and tail of my model looks different from the body, even though it has the same texture on it. However, I realize that this may be a modeling problem as the parts that I am talking about were the only ones that were extruded from the rest of the body.

Here is a picture of what I’m talking about: