2005-2026 Super Duty 2-Degree Pinion Shim Kit (CS-FPSKIT-3X2)Description The majority of stock applications work with pinion shim kits that have a 1 3 degree range, Carli states customers have had rear driveline vibrations around 70 mph while under load. After installing these shims, this issue was eliminated! Part Number: CS FPSKIT 3X2 Features 2 degree pinion shims Includes a new center pin Additional Info The end pinion measurement on the two tested vehicles was 4 and 5; both were perfectly smooth under