Rumbling Noise

[roversii]

Hi,

I have a '97 LX450 with close to 200K miles. Between 55mph and 80mph I have a loud rumbling sound (like a bad muffler, but the whole exhaust system is fine and the tires were recently aligned during the last oil change). It stops when I coast. It is at its worst when I am running at a constant speed. It is at its maximum level between 65 and 75mph and I can also feel it in the car but seems to subside as I hit 80mph. When I am accelerating or going up a hill it is reduced, but doesn't go away totally. Any thoughts? Differential? Something else?

Thanks,

roversii

[jimsmith1370]

Check you universal joints.

quote name='roversii' date='09 August 2010 - 07:32 AM' timestamp='1281360732' post='416672']

Hi,

I have a '97 LX450 with close to 200K miles. Between 55mph and 80mph I have a loud rumbling sound (like a bad muffler, but the whole exhaust system is fine and the tires were recently aligned during the last oil change). It stops when I coast. It is at its worst when I am running at a constant speed. It is at its maximum level between 65 and 75mph and I can also feel it in the car but seems to subside as I hit 80mph. When I am accelerating or going up a hill it is reduced, but doesn't go away totally. Any thoughts? Differential? Something else?

Thanks,

roversii

[roversii]

Thanks jimsmith1370. The folks at NTB serviced the front and rear differentials (not the middle one yet) and checked out the u-joints. The u-joints were fine. Sound is still there. Any other ideas?

roversii

[roversii]

Ok, NTB did the last differential service(transfer case). Still have the loud noise. Can't hear it from the outside (listening with the windows down on the highway). Only hear it from the inside.

Any other ideas?

Thanks,

roversii