Eric i dont know how intimate you are with Mopars specifically.
there are some factors that are different when diagnosing mopar type leaf sprung rear suspensions. the short front spring half is a factor. just to bring this to light not judge anyones knowledge..
i just want to put this out there..
If we are talking about mopar leaf sprung rear suspensions..
then proper rear shackle movement is a necessity to eleviate rear spring bind..in the extension of rear suspension travel..its a common problem for mopars...so is too short a shock itself..
these are both huge contributors to porpousing ..ie..hook unhook/unload..hook on a leafspring drag car..
as you can see i am passionate about this..
i am no expert...just someone who doesnt mind jumping in...ive helped fix this with a bunch of mopars...and some of it is ubiquitous in our world.
have at it..
cheapst..
and again Welcome...I am all ears..