was working on the front suspension of the dart. Getting the rack and pinion installed. I’d bolted the front wheels on to the front spindles and they were hanging free. I was moving the spindle to the tierod when some how the spindle came off the the upper ball joint and the full set up swung all the way down at full force, caught me squarely in the chest and knocked me back clear across to the other side. Flat on my back. Tried getting up to catch my breathe and starting vomiting clear fluids, for about 45 minutes. Managed to roll out from under the lift to outside where my mom finally saw me.