I have a 2009 gt. stock suspension except for lowering springs up front only.
Got a few questions:
Can somebody explain to me how aftermarket lca's eliminate wheel hop and give better launches? I mean, if they are the same dimensions as stock, what gives them better performance?
I also have been having problems with my rear tires slightly rubbing the edge of the fender when I hit a BIG bump or dip in the highway. My tires are larger than stock. It doesn't rub bad so I'm not really concerned but would lca's give me a stiffer ride and possibly eliminate some of the rubbing?

 

LCAs are either a round tube or cut from a single piece of solid alum making them much stronger than the stock stamped steel factory ones. Also the have stiffer bushing than stock allowing them to flex under load less, less slop. That is why they are better than stock. But to get the full benefit you should look into an adj UCA. Same benefits as the lower, but allow you to dial in the pinion angle.

My .02

 

But will the lca help stiffen up the rear and reduce the shock when I hit a bump in the road.
My tires will rub if I hit a large bump and I was wondering if these will help.

 

No I don't think they will. If you have stock springs in the rear and a proper wheel offset it should not be a problem

 

Does anybody know if there is any adjustment in the stock rear shocks?
Can I make them stiffer?

 

You can't adjust the shocks in the rear to stiffen them up. You said your tires are rubbing or are you hitting your bump stops?

 

Long story short, I have cervini exhaust...and it used to sit about 2 inches off the ground and scrape on everything. To fix this, I returned to stock rear springs and put on oversized tires (29 inch tall in the rear). Well, my clearance is now 4.5 inches and the exhaust is good, BUT the oversized tires now slightly rub if I hit a big bump. I am not concerned about it because it rarely and barely rubs. But yes, it is my tires rubbing slightly against the fender...not the bump stops.

 

Quality control arms like these from UPR control the motion of the rear end more accurately than the stock arms, primarily because the stock rubber bushings are very soft and floppy:
http://www.uprproducts.com/mustang-c...ushing-05.html

Double adjustable shocks will allow you to control the compression dampening which would keep the tires from slamming into the quarter panel, but you shouldn't use them just to solve that issue...
http://www.uprproducts.com/viking-mu...-shock-05.html

 

LCA will not keep your tire from hitting. A stiffer shock would probably be what you need but that will most likely come with less clearance. I could be wrong but a stiffer strut wouldn't change the distance of travel. Struts control the speed of travel.

 

Some thoughts here....

While a solid LCA is certainly going to be stronger and offer less flex than an OEM one, a harder bushing also has some downside and would be in the area of cornering & axle articulation. Neither of these are as big a deal on the S197 as earlier Mustangs, but if improved cornering is an ULTIMATE goal, I would consider one end of each rear control arm be a spherical end. This WILL add NVH to your ride, but improve all areas of grip.

Jazzer