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So long as your articles of formation / organization / bylaws do not preclude this or otherwise limit you to IT consulting, there's nothing that would forbid you from adding a ride-sharing business. The main considerations are liability and potential for "veil piercing". Liability is an issue because any of the assets of your LLC would be potentially at risk for any liability you incur in the LLC. So if there's a claim against your IT consulting side, they can go after the ride sharing assets, and vice versa. Keeping two LLCs would limit liability from one business to the assets of that business, and segregated from the assets of the other business.
The other consideration is that it could make piercing the veil (removing the limited liability of that and making it possible to go after your personal assets) more possible, because someone could argue that these two types of businesses are not really compatible with each other, and as such it's more likely that you're simply operating them with the LLC under an "alter ego". It would still be the burden of proof of the person alleging that to establish it, but it does make it more possible. The probability increase could be small (it's just one factor among many considered in a piercing-the-veil argument) but again, it does increase the possibility that this could happen, so it's a consideration. You'd just need to be that much more careful in keeping LLC assets segregated from your own, bank accounts separate, corporate records diligently kept, etc...
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Thank you, ***** ***** luck to you!