Gear Housing 3964422, which replaces 5264738, 3991069, 3936257, 3932120, and 3929565, fits Cummins 4B3.9, 6B5.9, QSB5.9, and ISB engines. It houses and supports the timing gears for proper engine timing. Built to OEM standards for structural strength and accurate alignment.
Condition:New / OEM Quality
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