I'm really new to using Box2D. I've setup a small thing with a Dynamic body that falls onto a static one. When the box hits the body, it begins "vibrating" for a bit and shaking, then suddenly stops. If anyone has used it or might know what is happening I'd appreciate it, 

That's the setup of the boxes.

	b2BodyDef groundBodyDef;
	groundBodyDef.position.Set(100.0f, 400.0f);
	
	b2Body* groundBody = world.CreateBody(&groundBodyDef);
	
	b2PolygonShape groundBox;
	groundBox.SetAsBox(240, 20);
	
	groundBody->CreateFixture(&groundBox, 0.0f);
	
	b2BodyDef bodyDef;
	bodyDef.type = b2_dynamicBody;
	bodyDef.position.Set(100.0f, 0.0f);
	b2Body* body = world.CreateBody(&bodyDef);
	
	b2PolygonShape dynamicBox;
	dynamicBox.SetAsBox(32.0f, 32.0f);
	
	b2FixtureDef fixtureDef;
	fixtureDef.shape = &dynamicBox;
	fixtureDef.density = 1.0f;
	fixtureDef.friction = 0.3f;
	body->CreateFixture(&fixtureDef);
	body->SetAngularVelocity(20);
	int32 velocityIterations = 8;
	int32 positionIterations = 4;

		world.Step(ticks_per_frame, velocityIterations, positionIterations);
		b2Vec2 position = body->GetPosition();
		
		float32 angle  = body->GetAngle();
		std::cout << angle<< "\n";

		SDL_Rect rect = {position.x, position.y, 32, 32};
		//SDL_Point point = {32, 0};
		SDL_RenderCopyEx(mainren, textures[0], NULL, &rect, angle, NULL, SDL_FLIP_NONE);

That's a very, very good point, I changed it to 20x10, and the other to 2x2, alas, still the same result

Edit: However rather than tripping out, it slides to the left a bit on landing and then freezes

I fixed it, thank you very much, it was an issue on my point not converting from radians oops.