ok so i have a 2004 rx 330 within the last 7 years i have replaced both front wheel bearings and both rear wheel bearings. i just did the psgr. side rear bearing today thinking it was the noisy one since other 3 were replaced before but to my shagrin i still have the noise,. sounds like a bad bearing sounds but the standard test for front bearings by turning left and right to listen for change in sound gives me no result. the bearing noise doesn't change. is it possible it is center driveshaft bearing making this noise? i have been repairing all my cars since i was 14 yrs old. i work at an automotive parts testing lab. i am trying to say i have over 40 yrs exp with many things mechanical THIS ONE HAS ME STUMPED! LEXMEX IF YOU ARE OUT THERE PLEASE GIVE YOUR OPINION. i have followed your advice since i got my first 2001 rx. i really need a break. i was laid off after 20 yrs and now earning 40% less so i really can;t afford repair shop and i have never paid anyone to fix my cars except for exhaust. i like to know work was done right so i do it myself.

 

I'd get your vehicle on a rack (possibly you know a shop) & get someone in the vehicle to run it up, my thinking is 2nd or 3rd gear. One of my cars ('14 focus st) had a similar bearing noise, so I had one of the guys run it up in 3rd & found it was the carrier bearing on the passenger side which was rattling, of which I swapped out the passenger side axle. So I'd carefully rack it up & have someone run it up & be careful of the rotating wheels, axles & driveshaft........

 

There are quite a few culprits that when failing can make a noise when the vehicle is in motion other than wheel bearings, like the Wear indicators on the brake pads,drive axles, front and rear diff, Carrier bearings, even the brake disc dust cover May be slightly bent and rubbing causing a noise
you can raise one corner of your Vehicle at a time,spin the wheel while having a long screwdriver on the Strut cartridge, and you will feel and hear the sound if it's a wheel bearing, the same procedure for checking the drive axles, support the vehicle, and while in neutral spin the wheel and put a long screwdriver on the drive axle where it goes into the transmission