I don't know if this will work on a malibu but I accessed that area on my prostar last weekend, the motor box is attached to that floor section, unclipped the box struts, removed the 4 screws that hold the rear floor section down, pried the floor section up from the rear and propped up with a 3 ish foot prop stick sort of thing. There are 2 grease fittings back there and one of them can't be accessed without raising the floor section, then some cleaning while it was open.