Im here a strange humming noise around 50mph and also some hesitation up hills sometimes. Im not sure what it is, does anyone know what happens when differential starts to wear or need oil, does the car hesistate at all?? Thank you for responses
that noise sounds like it may be your cowl vibrating. you can test it by duct taping the cowel, the black rubber where it meets the lower part of your windshield. and see if the noise stops. search cowl on here they have some remedies posted, it that is your problem.
thanks for your reponses, there is definately vibration with the humming sound and when i accelerate up a hill yes it does some sort of shaking and hesitation and this all started when the vibration noise came along, i never had the diff looked at, who should i take it to stealership or any certified mechanic?