I am assuming you are referring to the K1 spring kit, named for the K1 valve that gets the retrofit.

This is supposed to cure the 2-3 flare, so I doubt that it will do anything for your situation.

Nevertheless, the valve body is accessible from inside the tranny case once the pan is removed. The tranny remains in the car, and the procedure can be done in about an hour, depending on how much time is spent removing the pan, draining the fluid, and accessing the screws that allow you to remove the K1 valve.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car