The Packard Four Hundred was a milestone for Packard - it was the last model Packard ever released :(
The 374 Cubic Inch V8 Power plant was new for 1955.
Transmission was an Ultramatic auto, with optional electronic push-button selector (which proved troublesome, whereas the standard column-shift was fine).
Production ran through 1955 and 1956, when the model was dropped and the longer-running Clipper line continued for another year.
7,206 400's were built in 1955, and 3.224 in 1956.