2003 Toyota RAV4, approx 130K.
I'm desperate for some help. A month ago I put a new set of Goodyear tires on my RAV. I drive on the highway 35-40 miles each way to and from work every day. Immediately after the new tires go on, I notice a vibration from the steering wheel at highway speed, above 60 mph. I took the car back to the tire shop (an independent tire shop, not a chain) and asked them to rebalance the tires. They did, and I took the car home. Drive to work the next day, vibration is worse. Next day, my dad and I switch cars so he can take it in. The tire shop says the front end alignment is off, and adjusts it (for $70). Small improvement, but vibration is still there.
I took it in for the 3rd time this weekend, and they swap the front and back tires at my request, thinking this might help isolate the problem. The shop also checks my struts and says they are ok. (I don't even know what struts are, but apparently they are ok.) Now the vibration has moved out of the steering wheel and is coming from the rear and the floor. It does not happen when I apply the brakes or am on city streets.
What do you all think? Bad tire or tires? Something else going on altogether? What should I ask them to do?
Thanks in advance for your help!