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KMeloney,
Some movement is normal however there is no specification for this. I would recommend you to compare yours to a like vehicle. Please let me know what your dealership has to say.
Thank you,
Elizabeth, GM Customer Service
KMeloney,
I only looked up information for the Tahoe, but I will check into others as well. I have owned several vehicles that would move when you pushed on them. Not a lot, but they did move a little. There was never any issue with any of mine. However, not every vehicle is the same and I completely understand that. Moving 4-6 inches would have me worried as well. Did you bring this movement to your dealer attention?
Thank you,
Elizabeth, GM Customer Service