Gear Housing 5311269, which replaces 4936423, 4936418, 5309274, 3971015, and 6531320, fits Cummins ISB, QSB, B3.3, B4.5, B6.7, 4B3.9, and 6B5.9 engines. It houses the timing gears and keeps them properly aligned. Built to OEM standards for strength and precise fit.

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