Hello!

My car becomes very noisy from 25 mph and up. The faster I go, the noisier it is. At least I know it's not from the engine. What would make a lexus roar like a big truck in the cabin?

Thank you!

 

Wheel bearings, cupped tires. do you have AWD?

 

Switch to neutral at high speed and see if noise goes away. If so it's tranny or drive shaft related. If not it's wheel bearings or tires.

 

Yes, I have awd. Tires are almost new, less then 5000 miles. Will check the bearings, but, would bad trans axle fluid cause this? A friend said it sounds like the transmission is working hard, like asking to shift, although it's automatic. That's the sound.

 

how many miles in it?

have you drained and replaced all fluids?

 

Could even be if you have off-road tyres on the vehicle.

My 07 RX350 is usually nice n quiet, even with Yokohama Parada Spec X tyres (which are not off-road tyres).

However, it sometimes is pretty annoyingly noisy when driving in the opposite direction on the same road on which it was quiet (at same speed too!)

A mystery I haven't solved in 4 years of owning it.

 

125000 miles. Replaced break, transmission and steering fluids. Transmission fluid was not flushed. Just dropped the pan. I suspect the rear differencial. Could it be?

 

I suspect the rear differencial. And it also seems to be related to heat, that is, the hotter the supposed part gets, the noisier it becomes. Could it be?

 

Did you do as Htownblue suggested? Get up to speed and put it in neutral to see if the noise stops.

 

Thanks for your input. However, I do not think it is the tires, as I am using the same tires for somke time now and it was not noisy before.

 

I would do that first....

 

I did the test and the noise was still there. Also replaced differential fluid. No change. What should I do next?

Note: the shop guy said they used 3 litres of differential fluid, when the manual states to use 0,9. Is there space to put more? Is it ok to do that?

 

Have you eliminated wheel bearings?

 

Ok, I have a bad wheel bearing. Will change that and see if it solves all the noise. Turning the steering wheel left and right, left and right helped.

Question: is there any reputable source selling rear hubs cheaper than sewell that ships to Africa?

 

Sewell will ship to Africa? Truly an amazing company. i once shipped a book to Canada, never again, incredible bother.

Is it both of the rears?