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Strange Vibration/Rumble at 40 MPH
When I'm driving along and let off the accelerator (regardless of the speed) and gradually coast slower (such as if reducing speed to a lower speed limit, etc.), I've noticed an odd rumbling sound from what I think is the back right. It SOUNDS as if the right side of the vehicle is hitting a rumble strip (though not quite that loud). It starts as the Rav slows through 40 MPH; sometimes starting around 42-45 MPH and will continue through about 35 MPH. I can barely discern a vibration in the vehicle, but if I have my foot just over the accelerator pedal, I can feel it vibrate in unison with the noise. If I ever so slightly touch either pedal (accelerator or brake), the phenomenon stops. I can often replicate the situation, though not always. Any ideas?
A recent tire rotation seems to have exacerbated the situation; it was occurring before the rotation but seems to be worse now. The tires are all exactly 29 pounds (Toyota's recommendation). Front brakes are fresh; rear brakes are nearing time to replace, but are within acceptable limits. Rear rotors were replaced at the last rear brake job (summer, 2009) and appear to be ok. Lugs are all tight. Any suggestions?
"The Mighty Rav"