It's necessary to know the input gear's spline count before ordering a transfer case or rebuild kit. The Grand Cherokee fitted with a 5.2L engine and automatic transmission usually came with a 23-spline input gear. It's a good idea to remove the transfer case from any vehicle to verify the spline count before ordering any parts. Available input gear spline counts are 21, 23, 27, 29, and 32. Also, inputs gear depths change throughout the years.