2001-2010 Duramax Transfer Case To Transmission Adapter Gasket (331304A)

Fits

This is the gasket that goes between the transmission rear output adapter and the transfer case to seal and stop any leaks. It's thicker and tougher than those leak-prone "budget" gaskets and won't rip so easily.

When taking the transfer case off your vehicle, make sure to replace the gasket. The  4WD transmission adapter doesn't have an output shaft seal, meaning a gasket is necessary to keep the transmission fluid from leaking. It's NOT a good idea to use any RTV-type sealant on the gasket or mounting surfaces.

If the gasket is being replaced due to a leak, now is also a good time to inspect the transfer case for the dreaded “pump rub” issue and upgrade to a Transfer Case Pump Upgrade to ensure a long and healthy transfer case life.

Part Number: 331304A

• Prevents Leaks
• High-Quality 
  

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Can my original transfer case gasket be reused if it is not ripped?

It is recommended to replace the transfer case gasket any time the transfer case is removed from the transmission output adapter. It is cheap insurance against leaks that not only make a mess but could also damage your transmission!

 Are the perforation marks on the transfer case gasket normal?

 Yes, the perforation marks are part of the gasket production process

How tight do I tighten the transfer case mounting nuts for the NP261XHD and NP263XHD at the transmission output adapter?

The factory recommended torque specification is 37 ft-lbs for the transfer case adapter nuts for both the NP261XHD and NP263XHD.