The key to setting up a clutch-style limited slip is the selection of shims. Tom sells a kit with a broad selection of shims from 0.010 to 0.045 inch in 0.005-inch increments. With new clutches, Tom suggests starting with a 0.040-inch shim for each side gear. With our used clutches, we combined a 0.020-inch shim with a 0.030-inch shim to create a 0.050-inch package. Always place the shim between the case and the side-gear clutch plate.