to change my rotation on my mr outdrive do i need to change the upper or lower half or both w/eng. being std.

Contact the dealer of the type you have and ask the parts department> Or teck support have all the Id # when talking with them>

l am just wondering why you need to change the rotation on the drive??? Which drive do you have?

You did not explain why you wanted to do this, but at a minimum you would have to change your lower unit and propeller to the opposite rotation type.

you have to change the rotation of the motor not the drive. ask any one who has twin inboards.