It has been a while since I done ball joints on a town car. But, If I remember right it presses out from the top down. And there is no cap on the bottom it is just the way it is made.
However, like mhpautos said it is recommended to replace the whole assembly.
The Garage quoted you that because they will make more $$$$ on the job if they do it that way. Plus they have the tools to do it.
For the Shade Tree or Back Yard Mechanic replacing the assembly is the quick and most cost effective way. You don't need any specialized tools.
Also if you don't have a Ball Joint Press getting the old one out and new one in is pretty much impossible.
Hope this helped.
Tuesday, April 21st, 2009 AT 2:08 PM