Sealed pilot bearing for GM transmissions behind LS engines. This bearing is set up to install in the larger opening on the end of the crankshaft and accept a standard GM input shaft. Measures 1.705" OD x .590" ID. See measurement chart link for more information regarding this bearing. *NOTE* This bearing is used when installing a Tremec TKO behind an LS/LT engine with an aftermarket cast aluminum bellhousing.