LeoLem

Hello, everyone. I am new to here. I have a question about my RX300. I always have clunk sound, when I shift from D to R. I did do a complete full stop, and then shift the gear. I did a short investigation, and found out it maybe caused by a worn U Joint:
-------------------
If a universal joint fails it can make a clunking noise that occurs when the car is changed from drive to reverse gears. To check for this condition inspect the U joint and look for a light rust powder around the bearing cups. (http://www.2carpros.com/articles/clunking-sound)
---------------------

I am blind to cars, so I can not verify this statement. Can I visually inspect if the U Joint is good or not under the car?

Besides, I learned that the whole drive shaft should be replaced if U Joint is worn, is that correct? (that is a lot of money )


Any help will be appreciated. Great Thanks.

hypervish

Welcome to Club Lexus!

First question, your RX300 is AWD, correct? If so, then you can inspect the joints on the driveshaft, by getting underneath and taking a look. If it's FWD, then you will not have a drive shaft, thus you can rule out bad u-joints.

Does this clunk occur only on a cold start, or does it happen even after the vehicle is at operating temperature?

LeoLem

Thanks Hypervish.

It is a AWD RX300.

It appears when the engine is at operating temperature. It doesn't appear when the first time I start the car and shift the car from P to R every morning.

gazi001

Welcome to forum Leo. May be transmisson mount. You have to lift up the car and some one has to inspect from the floor.