...because when you do, you can (unintentionally and unknowable-y) shift the car out of Park. When the column is lowered, this can also move the torque shaft, and now the car can roll away!
I noticed this when I recently dropped the column to pull the IP. No disaster in this case due to my level garage , but after a day or two of getting in and out of the car working the IP, AC box, etc, I realized the car had moved rearward about 8 inches.
Chock your wheel!!
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