My transmission pan is confusing me. In all the books it shows the th350 with the square pan and modulator in the back, the th400 with the funny shape pan and modulator on the side and the th700r4 with no modulator. Now I have a modulator on the side like a th400 but not a pan of any mentioned. What is up with that? Ehh... the more I look at it it looks like a th400 but it still doesn't look exactly like it. It resembles in though.