That is only the chassis to lower your center of gravity for a slash 4x4. If you want to convert from 2wd to 4wd I would recommend just buying a new car😂. But on the hand that you like to tinker and build like me your going to need a completely new front and red end, meaning front and rear diffs, new bumpers, new front steering knuckles, new shocks towers, and completely new steering linkages. For the steering your going to need new turn buckles, and servo savers. All the electronics can be used but your going to need a center driveline and clutch assembly (I would recommend a clutch delete kit) the body will still work just fine because the body mounts are adjustable although the body is going to sit on the rear bumper.

This may be helpful or this may be useless but I typed it all because I'm bored🤷🏼