Just got a 01 suburban and it has a very loud whinni mg/grinding noise when i accelerate past 20 mph... It sounded like it was coming from the rear end so i checked the oil in the rear differential and it was empty so i filled it and now sounds like it is more in the front it only does ot while pressing the gas, ot stops when i either ker off the gas or ahift into neutral but continues when i press the gas pedel again... It has a grinding noise until i stop but doesnt start till around 20 mph.... And ideas are appreciated
Thanks
Thanks