In 2001 the first liberty was made the highest I know that for sure it came to market in 2002 and in the same year they had to lower it 3/4 of an inch. but about the rest I need an much assured answer because my friend have a 2004 liberty we measured him he was 18.5 so we think he dropped a 1/2 inch through the years and my other friend he has a 2005 liberty and he was 18" so that was weird so we checked a couple of libertys and it seems that most of 2005 to 2007 have the almost hight 18" to 18.25" but 2002 to 2004 they shared the same almost hight which is 18.5" more of 2002 and 18.75" 2004's but the 2004 crds were 18.5"
What I posted above are the correct heights
KJs are very well known to sag, weak springs on these allow them even with 70,000 or so miles to sag an inch or more
SO THE ABOVE POSTED HEIGHT IS ASSURED !
They all sag different amounts over the years
All below 19 inches need new suspensions, springs and shocks