Hamilton grid will get the penalty!
Hamilton will get a five-line grid penalty for the Bahrain Grand Prix after the gearbox change.
The FIA announced on Friday that Hamilton would pass a new gearbox on Saturday.
According to the rules, you have to go through six races with the same gearbox, and Hamilton will get a grid penalty.
His team-mate Valtteri Bottas has switched to a new gearbox but has been allowed to make changes this week without penalty since he made changes in Australia.
Hamilton said he was satisfied with the car after the training tours.
Mercedes confirmed that Hamilton's gearbox was experiencing hydraulic leaks during the race in Australia.
The team decided it would be too risky to use the same gearbox over it again.