Jopes,
Your correct. The tone ring did give him a problem. He had to machine the carrier slightly to bring the ring into alignment with the ABS sensor. I have put about 400 miles on it so far and it is much nicer to drive than before. The motor isn't screaming so loud you can't talk in the cab and I have picked up 3.5 mpg on the first tank. I realy can't say I have noticed any negative regarding the performance. It still has plenty of get up and go and the rpm's have dropped about 600 at 65mph.