Why do I want adjustable upper control arms? What am I adjusting, and how is it going to help me? Skool me, please. :)
I'm ready to send CHE all of my money, so make it quick!
--Ed
Ed, I'm sure glad you asked... I was wondering the same thing...
The advantage of the "double adjustable" uppers is that you can adjust them while they are in the car...without removing one end or the other.
What are you adjusting? Pinion angle, which "normally" only needs to be adjusted once to account for lowering or other changes to get it back within spec. Primarily you wind up with driveline vibration issues if it is out of spec. If you have none now, you may not need them.
Is there much chance that the adjustable lowers will change pinion angle, and if so, enough to merit buying the adjustable uppers as well? Sorry if this borders on stupid question territory, but I've never done anything involving changes to the rear suspension. It would seem that I'm not the only one lacking experience but not lacking interest in the products mentioned.
The adjustable lowers "might" change pinion angle since you are raising or lowering the back end of the car (thus raising or lowering the tailshaft of the tranny), but it might not be enough to worry about.
You really need the adjustable uppers to set pinion angle right, especially if changing tranny's