I believe that apart from the sport bumpers (front and rear), side moldings/skirts and different alloy wheels the ML430 sport is just the same as the regular ML430.
I don't believe there are any suspension/transmission upgrades either on the ML430 sport.
To summise:
The monicker 'Sport' essentially denotes an appearance package.
I don't believe there are any suspension/transmission upgrades either on the ML430 sport.
To summise:
The monicker 'Sport' essentially denotes an appearance package.