Have you read thru Dwight's article on how the bushings, shocks and overall friction will interact and can affect the suspension and operation? If not, you can download the article from the link halfway down the TL page at his website.
https://www.packardparts.org/products/parts/torsion-level-suspension/ Perhaps something is amiss in one of those areas or there is always the possibility that the 55 had the heavy duty bars released early in 56 installed. If that was the case it could be there is not enough weight to really have needed them and the car is riding high because of that. Conversely, if the 56 is lower than 10" it could be it is heavily optioned so somewhat low and would have benefited from them.
At least checking the bars would be easy to do as the bulletin mentions what and where to look to see if they are installed.
https://packardinfo.com/xoops/html/downloads/STB/56T-1.pdf If it does have the heavy bars or even if not, you might be able to lower the car by installing shorter links in front.
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=248688