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This replacement Output Yoke Flanged Nut fits the tail shaft of the TeraFlex NP231 Extreme Short Shaft Kit (# 4444400) or NP231 Short Shaft Kit (# 4444401 or # 4444402). The nut is 7/8" x 20 TPI and is crimped to ensure that the nut does not back off under torque load.
Specs: 7/8" x 20 TPI