Is the MIL indicating and have you checked for trouble codes?
I am not sure what slipping noises are you refering to but my guess is a belt noise. For noise diagnosis it is almost impossible to do it over the net as the physical vehicle is not available. You need to be very specific of the noise and its source in order for us to understand an maybe provide any recommendations.
Please consider a to help us answer more questions.
Wednesday, June 13th, 2012 AT 2:01 PM