Sounds like you're on the right track.

I'd start by checking toe, simply measure to get an idea how close it is, and feel for feathering of the tread inward or outward. I'm guessing you have a lot of toe-in.

Also look at the rear suspension, the torque-arm there is a common bushing failure and can cause on/off throttle steering of the rear, plus other bushings back there can steer the car.

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Gone to the dark side

- Jeff