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A high idle could cause the gears in the differential to slam in gear when D or R is selected. Perhaps a lack of vacuum as well. Wear and play in the differential gears also could cause the clunking.
The raising and lowering of the rear can be fixed by putting in a new differential mount (and consequently, new subframe mounts). With a new differential mount, the car still raises and lowers in the back when R or D (respectively) is selected, but the amount of movement is greatly reduced.
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