Re: Why change to XF upper control arms on an early falcon ?
Personally, I fit the upper XC onwards arms for two reasons.
1. The steel bushes and "pins" are getting expensive and hard to find.
2. They ride a bit better (not as bone jarring with stiff springs).
3. They have a stiffener plate that isn't on the earlier ones.
Now, I don't use rubber bushes, as I feel these are TOO compliant. I use aftermarket urephane (spelling!!) bushes.
Also, if I happen to fit the lot (upper, lower and stub), I NEVER fit the later calipers. I know lots of people are in love with alloy calipers, but they are rubbish. The caliper of choice is a KH.
Oh yeah, last point, the later caster rods (strut rods, radius rods, etc, etc) don't fit. You need to use your originals as XD onwards are shorter in the nose.