Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Floor Jack question › Reply To: Floor Jack question December 1, 2020 at 6:16 pm #987284 Richard KirshyParticipant Jacking up the front end, you’d want to block the backend of the rear wheels to prevent the car from rolling backwards providing the ground is flat and level. If it’s not best to block both the front and rear of the back tires