GlassTop09
Senior Member
As I understand it, all struts\shocks that are designed to work w\ the S197 platform should be designed to work within the full static OEM effective stroke travel length (determined by the suspension spring design) of this platform's suspension...unless the struts\shocks are designed to be position sensitive....this is where the control dampening\rebound valving operation is based on the specific ride height of a certain spring set being used w\ them so as to not cause the strut\shock to alter\change it's designed dampening\rebound performance across a predetermined effective stroke travel length change.According to the description, these Ford Performance shocks and struts have been engineered specifically for improved handing on both stock ride height and lowered 2007-2012 SVT Mustangs and 2005-2012 GT Mustangs. This kit features single adjustment modifications with two-way response. The struts and shocks will work with stock suspension components and aftermarket components.
What I don't quite understand, is how they can claim their engineered for both stock ride height and lowering spring applications? Perhaps I'm missing something here, but IIRC aren't dampers with shorter valving recommended and also more compatible for lowering spring applications vs dampers with longer OEM valving
Most aftermarket parts for these S197's nowadays are designed to NOT be position sensitive (for example, all Koni's fit this aspect) due to the popularity of folks using lowering springs to replace the OEM springs which will lower the effective static ride height from the OEM static ride height so the strut\shock has the internal design capability to "internally readjust" it's control valving to account for this change in effective stroke length (usually no more than 1 1\2") so the designed dampening\rebound rate performance will stay the same linearly as was initially designed for the static OEM spring's ride height thus the parts can be used w\ either OEM or most lowering springs......but there are still some parts out there that are designed to operate properly only within a specific effective stroke travel length thus making these parts "sensitive" to the static ride height of OEM springs (IOW's specifically designed to be paired w\ lowering springs only) thus will have a tendency to "top out" during full rebound travel back to static OEM ride height.....not good.
This particular Ford Performance strut\shock combo I've linked to is designed to NOT be position specific thus will work properly w\ S197 OEM springs of the MY's listed (as I intend to retain my OEM springs) as well as most lowering springs (as stated in the description) concerning effective stroke length changes due to static ride height changes whereas for example the other Ford Performance Dynamic strut\shock combo IS position sensitive thus is designed\intended to be used w\ a lowering spring set only....not used w\ OEM springs....as their control valving is predicated to operate within the specific lowered effective stroke length due to the ride height change of the lowering springs recommended to be used w\ them.....note the description for this set does not state any compatibility w\ OEM springs so shouldn't be assumed that they are.
Packages that are position specific should list the effective control stroke travel length or which brand\type of springs are recommended\compatible w\ that measurement or both.
Bilsteins for example gives both on their web site for their struts\shocks but most only give the type\brand of springs that are recommended to be used.....if given at all.
So don't assume that any aftermarket brand strut\shock made for these S197's are designed to work w\ both OEM springs AND most lowering springs concerning effective static control stroke length unless they specifically state so in their descriptions...........that is, if you intend to keep your OEM springs in use but use aftermarket struts\shocks w\ them......otherwise it becomes more of a moot point.
Hope this explanation helps.
Check out Koni's web site, in their FAQ section if desired..............