if i like to use magnumforce dropped spindles in my 66 barracuda with factory 4 piston discbrake, what would i have to change only upper a-arm or more ?
I believe the Magnum force dropped spindles are only useable with the later style single piston dick brakes which means, if I'm correct, you'd have to change the upper arms and brake calipers/rotors and would end up with different bolt patterns front and rear at least until you upgrade the rear.
I've showed this photo before as this 63 valiant had the 73-up disc brake swap,(big upper ball joint,or you can use the adapter kit from Dr.Diff. It also had FatMan Fabircations 2'' drop spindles alowing you to have full suspension travel but a lower stance. In this photo the front wheels are 14''.