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Originally Posted by Brad Roberts
I'm now wondering if having the rear mounts that protrude UP into the tub, would have also cured your issue with harmonics (by lengthening the shaft travel) and not changing the ride height.
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shaft travel wasn't the problem; the issue was a genuine harmonic frequency issue. i calculated the natural frequencies of the front & rear suspensions based on spring rate, motion ratio, etc. They are only 3% different front to rear. what this means is that at lower speeds when a bump is encountered, the front is compressed while the rear is extended. this causes excess pitch / dive motion. this is cured in road car suspension design by running a rear ride frequency that is between 10% and 20% higher than the front. this allows the rear of the car to 'catch' the front over bumps so the car stays flat.