Physics ... Not physicallying

Hey guys, I’m currently experiencing an issue with vehicle physics in engine.
I’ve followed roughly 15 guides that are pretty much exactly the same, action for action, absolute perfection, but having the same issue every time.
The wheels.
I have anim bp’s, physic assets, car bp’s, etc etc, everything possible needed to make it move is done.
But it doesn’t. The wheels will spin and turn and stuff, but the car will drop to the ground and the wheels will sink through the ground as if they almost don’t exist.
Any ideas what could be causing this? The physics are set on the wheels etc, have tried Kinematic, Default, Simulated. Physics are enabled, have been through hundreds of values and nothing ever changes the result.
Any help will be greatly appreciated, at this point beginning to think UE4 is just buggy, but open to ideas.
UE4Editor_1YDyY5MRfF.jpg
Edit: ^ As you can see, the model sinks into the floor completely ignoring the wheels’ physics.
The wheels steer and spin but do not propel the car forward.

Does every single movement need an animation? For example, for the car to move forward, does the chassis/engine/diff/trans/driveshaft/body all need a simple animation that allows them to drive forward as the wheels require an animation to rotate?

Update: I’ve just inspected the blueprint for the regular vehicle template, it seems both the regular template and my custom game mode are both set up identically.
Is there possibly a setting in the project settings I’ve missed? They look identical to the template settings with the exception of axis inputs where the template version has a lot more (for different controller types).
Or is there something else I could be misunderstanding?