Dually conversion help!

[godfryness]

Hey guys. Need some help. I just finished doing a dually conversion on my 02 f350. I swap my 10.5 for a like year Dana 80. Every thing went very well thanks to what I have learned on this site. My only problem is my abs light is now on. It was not on before. I went to ford and put the right Dana 80 connection on so it would work. It fits in the abs sensor on the d80 just fine. I clear the code and it comes back on with out driving.

I think maybe the d80 sensor may be bad? Did i wire the conection wrong? Is the ring tone gear different for what the computer thinks? Any help would be great. I hate lights on my dash. Don't know if this is important but I changed gears from 3 73 to 4 10's. Thanks chad