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With the coupler installed, and the gasket in place on the mounting surface, a small straight edge is used to determine the gap between the end of the coupler and the face of the adapter housing. This dimension is important because it will determine how deep the new input shaft fits into the front of the GV under/overdrive pump. Shims are used to arrive at the correct depth. The metal shims are first used between the coupler and the straight edge.