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Rhythmic shudder beyond 60 MPH - 1999 ES300
Hey guys, I'm sure some of you have noticed my ongoing 1999 ES300 resurrection project. Well, I ran into a snag and need input.
I took it for a test drive, and right at 60 MPH (until 80 MPH), it starts shuddering rhythmically. Shudder moderately hard, then nothing for a second, then shudder, then nothing for a second. Like a metronome, there is no variation. Here's what else I observed:
- it's not dependent on throttle. If I let go of the throttle, it will keep up the shudder on/off until speed drops below 60 MPH, at which point it will abruptly stop
- inner and outer tie rods are good, wheels will be checked for balance when I align it this week
- driver's side lower control arm's rear bushing has a tear, but I don't think suspension components could cause shudder like this
- car has two 205 tires and two 195s. They were crossed, so I moved 195 to the back. No change
- between 20 and 40 MPH, steering wheel will shudder when braking. I think this is unrelated, possibly a warped rotor
I'm hoping it's not the transmission/torque converter.
What do you guys think?
Thanks as usual.
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