SPC Performance 13421 Increased Strength, Adjusts Rear Pinion Angle 3, Extended Articulation.

The SPC Performance 13421 is a heavy-duty rear differential shim kit engineered to correct pinion angle on lifted trucks and SUVs. This high-strength shim provides up to 3 degrees of pinion angle adjustment, helping eliminate driveline vibration and ensure proper u-joint operation after suspension modifications.

Key Features:

• Adjusts rear pinion angle up to 3 degrees for optimal driveline geometry
• Increased strength construction for durability under heavy loads
• Extended articulation design maintains performance during suspension travel
• Corrects driveline vibration caused by lift kits and suspension modifications
• Precision-machined for accurate angle correction
• Helps extend u-joint and driveshaft service life

Installing this differential shim kit restores proper pinion angle alignment, reducing wear on driveline components and improving overall ride quality. Ideal for vehicles with aftermarket lift kits that experience driveline vibration or u-joint binding.