Lowering Spring Question

I have been wondering about lowering springs. i have heard that if you lower your mustang you have to buy caster/camber plates to get it all aligned right. can anyone tell me if they are needed or what all do i need to know before i consider doing it. thank you
 
The advantage to getting C/C plates is not just so that you can get the alignment to spec but you can actually set it to a diffent and more aggressive spec that you just can't set it to in stock form. The 4 bolt MM plates are great and they give you a revised alignment spec in the instructions.
 
Generally, if you don't dropp more then 1.5", your not "required" per say. But i think its good idea to have them. you can tweek them more for better handring and stuff...
 
you CANT align the rear of a solid axle car!!!!!! unless you got an IRS cobra all you can adjust is the front. i'm an alignment tech for goodyear. trust me i work with these cars everyday. if you drop it get the plates. stock plates give about 0.5 degrees adjustment. M/M plates give you at least 4 full degrees. and the caster is adjustable independantly from the camber with the M/M. they are the ONLY plate that i have or ever will put on my personal vehicle.