There's no single mountain called "Transantarctic". The term "Transantarctic Mountains" refers to a massive mountain range that stretches across the entire continent of Antarctica.

The highest peak in the Transantarctic Mountains is Mount Kirkpatrick, standing at 4,528 meters (14,856 feet).

It's important to remember that the Transantarctic Mountains are a range, not a single mountain. Therefore, there isn't one specific "height" for the entire range.