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There is a guy on 190rev that makes the solid flex disks. If you are getting bucking you need a new rear trans mount. I filled mine with loctites roof flashing glue sealant (polyurethane). No bucking but a lot more noise in the cabin. There is also every other part of course but if the engine is bucking thats where you should be looking.
Now if you are talking about extra movement in the rear end, linkages, rear diff mounts, subcarrier mounts etc.
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