What Is a Pump Rub Kit

Pump Rub refers to a gear pump failure in GM transfer cases from 1998-early 2007. The gear pump works by forcing oil to the planetary as well as the drive sprocket sleeve. The gear pump is driven by a shaft, so the housing of the pump must “float” in the rear housing of the transfer case.

What does a pump rub kit do?

Pump Rub refers to a gear pump failure in GM transfer cases from 1998-early 2007. The gear pump works by forcing oil to the planetary as well as the drive sprocket sleeve. The gear pump is driven by a shaft, so the housing of the pump must “float” in the rear housing of the transfer case.

Does a transfer case have a pump?

GM transfer cases use a gear-driven pump inside the case that is driven off the mainshaft. Because of this design, the pump must “float” in the rear case half. There are four tabs around the edge of the pump that are used to locate it in the housing.