pjw73nh
Well-Known Member
- Joined
- March 20, 2011
- Messages
- 238
- Reaction score
- 1
- Year, Model & Trim Level
- 08 LTD
2008 Ltd 4.6L 115k miles. Intermittent humming noise/fine vibration from front (feels like it might be right under drivers feet)
Just started with colder weather, but it's been warmer since and has not changed the sound. I don't think it's weather/temperature related.
Mostly at very slow speeds, only when turning left with slight load (IE making a slow left turn while on slight uphill incline). Definitely not engine noise.
I am thinking maybe transfer case/differential issue or perhaps U-joint(s). Both front wheel bearings are Timken and done within the last 20k. The sound does not sound like wheel bearing noise. It goes away completely after the turn is complete, or I speed up (above 5-10 MPH). Does not sound like CV joints either. Car rides beautifully all other times and speeds. No noises vibrations etc. Only happens on a slow left turn under very slight load. It is definitely increasing as time goes on.
If I put it in 4WD high, the noise is much more pronounced, easier to reproduce, and appears to happen at the same slower speeds, but on BOTH a right or left turn. Not just a left turn.
Any thoughts or help in diagnosing this much appreciated.
Thanks.
Just started with colder weather, but it's been warmer since and has not changed the sound. I don't think it's weather/temperature related.
Mostly at very slow speeds, only when turning left with slight load (IE making a slow left turn while on slight uphill incline). Definitely not engine noise.
I am thinking maybe transfer case/differential issue or perhaps U-joint(s). Both front wheel bearings are Timken and done within the last 20k. The sound does not sound like wheel bearing noise. It goes away completely after the turn is complete, or I speed up (above 5-10 MPH). Does not sound like CV joints either. Car rides beautifully all other times and speeds. No noises vibrations etc. Only happens on a slow left turn under very slight load. It is definitely increasing as time goes on.
If I put it in 4WD high, the noise is much more pronounced, easier to reproduce, and appears to happen at the same slower speeds, but on BOTH a right or left turn. Not just a left turn.
Any thoughts or help in diagnosing this much appreciated.
Thanks.