I bought my 93 tc in march 04, and the rear bags went out july 04, I replaced them with springs from a crown vic and air shocks, haven't had a problem yet. If you don't have access to a lift, get the rear up on jack stands, unbolt the shocks. I believe there is a clip that holds the bags to the axle but I honestly don't remember anymore. The one issue I had get the coils in is if you don't have a spring compressor you may need to jack up one side of the axle to help get the spring seated properly.