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I don't quite understand the rear steer fix...does replacing the rear bushing with a non flexible one accomplish the same thing as replacing the toe adjustment bar with the ones with spherical bearing on both ends....
On the 2nd generation RX-7 "FC" the non-compliant (steel sleeve in hard Delrin bushing) "DTSS" eliminator bushings replace the stock dynamic toe steering system bushings that incorporate calibrated compliance in one direction on the triaxial rear hub.
Aftermarket camber rods (the long rods from rear trailing arm to subframe) replace the stock lateral links so that one may adjust toe at this rod instead of at eccentric at the front of the trailing arm.
This might be done because it is much more accurate to adjust the rods x number of turns at the track than using the eccentric cam which has slop in both directions and also has limited range which may be a problem with a very low (or high) vehicle ride height.
The vertical Red link in the photo above that connects the rear subframe to the unibody is an adjustable camber link. This pushes the subframe to differential mounting area up or down to adjust camber. It effects camber slightly differently side to side as it is not centered and relies on subframe to unibody mounting bushing compliance to work.
The other way to even out or adjust camber is the very short links between the front inside of the trailing arm to the rear subframe. These can be fragile and bind/break. Powered By Max has a robust design that does not break.
The one thing you never want to do is put a poly bushing at the front of the rear trailing arm as this is a multi-axis pivoting point and will bind. Leave it stock or go with a spherical bearing upgrade.
Never do this ^^^
This is fine vvv
The rear subframe is held to the unibody through the aforementioned complaint bushings and a compliant 3rd link (or aftermarket directionally compliant spherical camber link). If you want to make this solid to keep the whole rear suspension from moving around you will need to incorporate the movement necessary for various camber settings. Powered By Max again has a solution.
