bandit
Well-Known Member
Hope it's ok but this is pertaining to a Cadillac awd and why I am posting in the general area. I think the problem should be generic to a general awd drivetrain. Admin, if this is not ok, let me know and I will delete the post.
Just started noticing a whooshing/whirring noise coming from the rear end. (or at least it sounds like it's coming from the rear from inside).
These are the isolated characteristics of the noise.
-while driving, when pressing the accelerator, even a tiny bit, it makes a whooshing/whirring noise from the rear. I can pulse the gas pedal lightly and hear the noise go in and out. The tone kind of rises in and out with respect to the pedal if that makes sense. Not just an on and off.
-going through gears does not influence the tone or volume but the tone does gradually increase with respect to the speed of the car as long as the accelerator is still pushed.
-letting off the accelerator, the whooshing/whirring goes away but it is now making a different lower sound, not as loud. Also sounds like it is coming from the front after letting off??
-if you throw it into neutral, the noise completely goes away
-do not really hear it in reverse accelerating but once you let off the pedal and coast, the whooshing comes on. Not as loud though
-while coasting slowly down hill in gear and no acceleration, it almost sounds like bad wheel bearings faintly rumbling, but again if you throw the car in neutral, the noise goes away.
-changed carrier(differential) fluid and added LS additive. Oil was pretty dirty but the change made no difference. Going to change the transfer case fluid tomorrow but not holding my breath.
No other discernible noises like pulsations, clunks or rattles. No affect on driving.
Anyone ever run into this condition on an awd vehicle?
Just started noticing a whooshing/whirring noise coming from the rear end. (or at least it sounds like it's coming from the rear from inside).
These are the isolated characteristics of the noise.
-while driving, when pressing the accelerator, even a tiny bit, it makes a whooshing/whirring noise from the rear. I can pulse the gas pedal lightly and hear the noise go in and out. The tone kind of rises in and out with respect to the pedal if that makes sense. Not just an on and off.
-going through gears does not influence the tone or volume but the tone does gradually increase with respect to the speed of the car as long as the accelerator is still pushed.
-letting off the accelerator, the whooshing/whirring goes away but it is now making a different lower sound, not as loud. Also sounds like it is coming from the front after letting off??
-if you throw it into neutral, the noise completely goes away
-do not really hear it in reverse accelerating but once you let off the pedal and coast, the whooshing comes on. Not as loud though
-while coasting slowly down hill in gear and no acceleration, it almost sounds like bad wheel bearings faintly rumbling, but again if you throw the car in neutral, the noise goes away.
-changed carrier(differential) fluid and added LS additive. Oil was pretty dirty but the change made no difference. Going to change the transfer case fluid tomorrow but not holding my breath.
No other discernible noises like pulsations, clunks or rattles. No affect on driving.
Anyone ever run into this condition on an awd vehicle?