Some may disagree, but those UMI are fine. Go with the adjustable ones. Honestly, though, upon acceleration, the lower arms try to compress (shrink in length), and the uppers are trying to be pulled apart (grow in length), so I believe the uppers don't need to be incredibly strong. It's the lowers that need to be beefy. The adjustability comes into play when you have a lowered car, and want to keep the pinion angle consistant. Or, for strictly drag racing, adjust the pinion angle so that at ride height the pinion is 2 to 3 degrees downward. I think that's right. or I'm wrong and just rambling :lol: :lol: :lol: