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You might be overthinking this. As long as you are generally on flat ground, this should be a non-issue. Your car needs to be on flat ground so when you fill up the transmission, the fluid will seep out when full. If you are on a pronounced hill, you may overfill or underfill (depending on orientation). However, on a very minor slant such as your 2 inch difference in your garage, I don't think you will encounter any issues.
Somebody correct me if I'm wrong.
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