You may or may not need any shims. Measure as-is, see how far off you are. Turn shims around, measure, then remove shims and measure. Pick the one that leaves your pinion angle 1-2 degrees below the t-case flange. With a single cardan driveshaft, you usually don't need shims with a simple spring lift. Many spring companies include shims just in case you are installing on a double-cardan (CV) shaft setup, such as on a pickup with a center support bearing/2-piece driveshaft.

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