Wow. I was thinking this went in between the trans mount and the bottom of the transmission itself... I would never have thought it went along the side of the car where the crossmember bolts to the frame. But that makes sense.
The tires are 6 years old now but they sat a while before I bought the car in 2016. I probably should investigate the tires and wheels. The vibration is in the seat/floor pan. I can see the passenger seat back oscillate at about 11-14Hz, similar to each wheel rotation at speed. I have moved wheels around but there's no change. No steering wheel vibration or shaking at all. This is why I kept thinking drum/axle/diff...
Let me add one thing: The vibration is worse when there is more air in the tires. At 35+ psi the vibration is very noticeable. With less air (under 30 psi) it is reduced but still there. The tire place says all of the wheels and tires are balanced. I figured if I moved them around the vibration would change from rear to front but it didn't.
The tires are 6 years old now but they sat a while before I bought the car in 2016. I probably should investigate the tires and wheels. The vibration is in the seat/floor pan. I can see the passenger seat back oscillate at about 11-14Hz, similar to each wheel rotation at speed. I have moved wheels around but there's no change. No steering wheel vibration or shaking at all. This is why I kept thinking drum/axle/diff...
Let me add one thing: The vibration is worse when there is more air in the tires. At 35+ psi the vibration is very noticeable. With less air (under 30 psi) it is reduced but still there. The tire place says all of the wheels and tires are balanced. I figured if I moved them around the vibration would change from rear to front but it didn't.
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