IF your wiring has deteriorated over the years, a grounding kit might have some value. If you have installed a larger amplifier for your stereo, a grounding kit might do some good. If you have installed any other high-current devices (eg, big fuel pump), a grounding kit might help. Otherwise, it's pretty much snake oil.
I can see no way that it would help the 7AT with shifting - unless you have a grounding problem to start with. If you have a grounding problem, just install a larger ground wire to the transmission (no need to do the whole car).
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