First, thank you all! Posting another update, inevitably with corrections of how the story was told, as I’m just a layman owner of a 9 year old car trying to learn a new complicated topic. Many of you may have already figured out what happened to the car, but I was hopelessly (may still am) confused. Possibly one more update tomorrow morning after I meet with the dealer mechanic again.
After more conversations I think I now better understand the difference in opinion here (trying to be open minded still). The dealer service manager holds that, because the sway bar mounting hole on the wrong strut is one inch lower (disregarding the confusing description in terms of the length of the strut), it had the effect of pushing down (or holding down) the control arms. There should be normally a resting position for the suspension and the control arms when the car comes to a stop, but no longer with the way the struts and the sway bar were installed. The result is the control arm bushings never getting a rest.
A corporate rep from the non-dealer shop disagrees: the control arm is designed to move around and merely pushing it down and driving for 5000 miles would not have caused any damage, let alone enough damage to call for replacement. Seems possible that the 9 year old car with 65000 miles would have already had some cracks in the bushings. And as some of you pointed out, new control arms may not be the most economically sensible solution. However, putting these two opinions together, can any reasonable and objective person reach a conclusion that it’s at least a possibility that the control arm being consistently pushed down hastened the arrival of the end of its life? Some of you already suggested that in some cars that’s possible. But what about this particular year and model (2006 Sienna)? Even if there isn’t any black & white answer, can the non-dealer shop absolutely deny any possible link between the struts and the control arm bushing giving up? I think these are relevant considerations in a reasonable settlement.
A quick recap for those who don’t want to go back to the beginning of the thread. I went to a non-dealer shop for noises which were attributed to rack & pinion. In addition, the shop recommended replacing the front struts. After the shop ordered and installed the struts, there was increasing vibration at highway speed. (Other possible relevant facts not in my original post: windshield was broken during the work on the struts; metal to metal noise from the suspension on the way home right after the installation was fixed a day later.) Some other unrelated events later, I had the car sitting on a lift at a Toyota dealership. Then came the diagnosis of control arms. A day later the diagnosis that new control arms can’t be installed because wrong struts were in place. (The struts were installed with the original springs.) Dealer invoice said: “THE CURRENT STRUTS ARE AFTERMARKET AND 1” LONGER THAN THE FACTORY TOYOTA STRUTS ON THE BODY, CAUSING EXCESSIVE STRESS ON TIE RODS AND LOWER CONTROL ARMS. THEY ARE BINDING AS WELL.” All the corrections were then completed by the dealer, costing me an additional 2,700 in addition to what I paid the first shop for the wrong struts. The first shop is now offering to foot the dealer bill for the struts (about 1,200 parts and labor), but not the rest for the control arms.
Very flattered that my question received this much attention. I initially wanted to keep the story short, without the drama, and focus on the technical question. Yes, I did offer the first shop the opportunity to correct the problem. However, their reaction was that they were absolutely certain they ordered the only possible aftermarket parts. “It’s not easy, almost impossible to order the wrong parts (for this car and issue).” Note that the car was on the lift at the dealership at that time. Do I then take a risk, pay the dealer for the time they spent (which the first shop would never agree to reimburse based on their reaction), and take the car back to the first shop only to be told that they confirmed it’s the right parts, with me holding the bag still uncertain who was telling the truth? There were some other trust issues at that point. . . Well, it turned out they did use the wrong parts, as the rep admitted. The parts they installed were for the front wheel drive model, and mine is all wheel drive. They checked with only one aftermarket supplier who doesn’t have the strut for the AWD model. They only needed to check with another supplier but didn’t. . . They should have noticed something wrong with the stabilizer link position as the dealer did, but didn’t say anything.
To GeorgeSanJose – the original shop said they would not have recommended to replace the control arms if they merely observed cracks in the bushings. They don’t have any notes in that regard, obviously.
To Nevada_545 – Unfortunately I don’t have any pictures for the damaged control arms. The dealer mgr is trying to find one. The incorrect position of the stabilizer link mount did possibly cause noise, but the original shop was able to fix that quickly the next day.