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The only specialty tool you need to fully rebuild an NP231 is a nice set of snap-ring pliers. After removing the front yoke, rear tailhousing, and separating the case halves we stripped the T-case of its guts. You'll need to remove the input shaft snap ring and gently tap the planetary out with a dead blow since the input shaft is a slight press fit into the case bore. The input shaft is inserted into the new six-pinion planetary and then can be installed into the case.