Lower

[Cuda_451]

How would I lower the front end using the torsion bars or stock front suspension?

[HP2]

Unscrew the ride height adjusters that are located in the middle of lower control arm.  Put the front end in the air, crank them down a couple of rotations per side, drop, bounce, and see where it settles.

If you drop more than 2" you'll need a new alignment. Ask your shop to use '05 Mustang GT specs, or at least as close as they can get them.

[anlauto]

You should loosen the two large nuts on the front of the control arm pivots when making any ride height adjustments 

[72bluNblu]

Dropping or raising the car any amount changes the alignment. Small changes can be ignored because the change in the alignment is small too, but once you start closing in on an inch of drop a new alignment may be necessary. The biggest thing is that the toe changes, and that's a small window to maintain to keep from wearing the tires. Obviously caster and camber change as well, but much larger changes are needed there to cause issues.

And if you drop the car more than a 1/2" or so from stock with the torsion bar adjusters you had better plan on upgrading the torsion bar size as well, because much more drop than that and the stock torsion bars won't be enough to keep you from bottoming out the suspension.

[Bullitt-]

Before you invest in an alignment you might wanna get the Moog offset bushings in the upper control arms.

info http://www.cuda-challenger.com/cc/index.php?topic=106714.msg1047587#msg1047587

[spamtank]

 

[dodj]

You should loosen the two large nuts on the front of the control arm pivots when making any ride height adjustments 

X2
unless you are just looking to lower a 1/4" or something.