I've got them on my car but on the fronts one side has got a ridicuosly stiff ball joint on the outside end (where taper goes up into knuckle). I had the lower arm attached to the car with just tension rod, shock and knuckle and it was ridicuosly stiff trying to turn the hub lock to lock.
I got them 2nd hand and at the time I had just assumed it would free up after a while seeing as most balljoint related stuff tends to slacken up after a while but it is still stiff as hell after alot of driving and drift days. The car has really weird steering for an s-body and I've driven quite a few now, you have to self steer it loads when on a shallow/mid angle and feels like the steering isn't keeping up with the angle your drifting at. The alignment is setup on it so it should self steer. Now wondering if it's down to that one stiff ball joint as I've tried everything else.
I want a PBM lower arm/tension rod combo, the quality looks loads better and tension rod moved.