No sooner than I completed my previous post than I read similar post in TaurusClub forum about a 21.5mm rear bar. I looked again on the Tasco website and found a DG1Z5A772F for police interceptor w/o HD suspension. So I may have just been checking cross reference for the previous mention bar will fit the all mentioned Taurus/Explorer/Flex/etc. applications. My bad. My goal is to find an alternate part number bar. I know someone who works in ride and handling department at Ford who offered to check part numbers. I'll give him the two part numbers to get confirmation of bar diameters.
Regarding H&R springs, mine just arrived yesterday from TireRack. I plan to initially install the rear springs to get rid of the off-road look. Provided the car retains a level or slight lower in front rake, that may be all I do. Typically the spring rate is increased for the lowering springs to compensate for reduced travel to prevent bottoming. While the increase rear springs stiffness might improve cornering balance to reduce understeer, there is also an effect of change in suspension geometry lowering the roll center as well the rear CG. Because of this, and without data such as the spring rates, this becomes difficult to estimate. This is becomes a seat of the pants exercise. After installing, I will reset camber and toe-in to same as I measure before installation. I plan on doing this before end of January.
