Terry,
Before you spend more exspensive money- unless that is your thing
first thing you want to check are the bolts holding in the lower control arms.
The situation is the bolts will be tight going into the frame backets, BUT they are to small for the bushings! Not much, maybe a full 1/16th all the way around but this has caused more than one vibration. Think about it, goes under load, the slop in the undersized bolts to the bushings are now taken up and wont wobble/vibrate until enough pressure is released, then the whole thing can start all over again.
I haven't seen a CR without this problem!
Solution is drill out the frame attaching brackets to the same size as your ID of the bushings, one bolt larger- now that at least is fixed! Still got the vibration time to go om to the next step.
DV