Review on ACDelco Specialty 504-511: Top-performing Rear Air Lift Shock Absorber for Unmatched Suspension Performance by Josh Hamler

I ordered these for my '67 Impala that needed a little help raising the rear of the car. I only have to keep about 50 pounds of air in them to get the job done. The car has new springs all round and while I was waiting for the front springs to seat, the rear ones were still a bit low. For the money, a name you can trust, an easy setup you can't go wrong with.