mhopton
NAXJA Forum User
- Location
- Marietta, GA
I've searched exhaustively here and other places and can't seem to figure this out. My XJ is a 99, 110k miles, daily driver, no lift, Aw4, 231.
This groan sounds a lot like bearing noise and it isn't noticeable below 68-70mph. Above 70, the sound increases exponentially - at 78-80mph, it's plain L.O.U.D. There is an ever-so-slightly noticeable high-frequency vibration that is very slight and only noticeable on smooth road. Otherwise, smooth as can be.
This has been around since I bought the jeep w/89k. All services have been done and I have recently done the following to eliminate potential areas.
1) AW4 filter and oil change
2) fr/rr differential service
3) 231 oil change
4) new tires, Toyo Open Country H/T
The tires ride beautifully and really quieted down the highway noise, yet made this high speed groan much more noticeable. When changing fluids, all the drive-shafts appeared to be sturdy and solid with no movement detected at the joints.
Could it be front unit bearings at 110k? This Jeep has lived an easy life - never wheeled and always serviced properly. When I purchased the Jeep, I replaced the PS Pump & lines, steering box and exhaust header. Everything else is stock.
thanks
This groan sounds a lot like bearing noise and it isn't noticeable below 68-70mph. Above 70, the sound increases exponentially - at 78-80mph, it's plain L.O.U.D. There is an ever-so-slightly noticeable high-frequency vibration that is very slight and only noticeable on smooth road. Otherwise, smooth as can be.
This has been around since I bought the jeep w/89k. All services have been done and I have recently done the following to eliminate potential areas.
1) AW4 filter and oil change
2) fr/rr differential service
3) 231 oil change
4) new tires, Toyo Open Country H/T
The tires ride beautifully and really quieted down the highway noise, yet made this high speed groan much more noticeable. When changing fluids, all the drive-shafts appeared to be sturdy and solid with no movement detected at the joints.
Could it be front unit bearings at 110k? This Jeep has lived an easy life - never wheeled and always serviced properly. When I purchased the Jeep, I replaced the PS Pump & lines, steering box and exhaust header. Everything else is stock.
thanks