I just bought a '07 GX470 last week from a private seller in my neighborhood. Incredible condition; with just under 30K miles. I test drove it and felt the clunk, but figured it was worn brakes (at the time I knew nothing about the infamous clunk problem).
I bought the vehicle, then on a whim decided to research the clunk. I'm happy to say I found this site (and the clunk info) and took my vehicle to the dealership here in Portland with the TSB in hand. I am not joking when I say I snuck in exactly 1 day inside the expiration date of the 6 year powertrain warranty. It was divine intervention!
It took them some time to get the driveline, but I just got it back today. It's now perfect - no clunk!. While it was in, I had them resurface the rotors since I noticed a little bit of shimmy when coming to a stop. All four rotors had close to 0.040 thousandths runout (about double the allowable spec). Now it glides to a perfectly smooth stop. No clunks, no shimmy.
I also felt a slight bit of steering wheel jitter at highway speed, so I stopped into America's Tires on the way back from the Lexus dealership and discovered they were having a 3 day sale. I had them mount up a fresh new set of Michelin LTX A/T 2 tires. I asked them to very carefully balance them - and I'm happy to say the steering wheel jitter is now gone!
The tires out the door with full replacement warranty was $970 with a $100 rebate.
I feel like I've been really getting lucky with this GX470. I love it!
-pstallbaumer
