Bilstein recommends upgrading to an aftermarket upper control arm (UCA) when the front suspension lift exceeds 2 to 2.5 inches.
Why Upgrade the UCA?
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Improved Suspension Geometry – Aftermarket UCAs correct caster and camber for proper alignment, which factory arms may not achieve at higher lift heights.
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Increased Suspension Travel – Their design allows more down travel without interference from the coil spring or frame.
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Reduced Premature Wear – Factory ball joints can be stressed at extreme angles after a lift, while aftermarket UCAs maintain better joint alignment and longevity.