2001-2007 Duramax Transfer Case 261XHD (10603)

Fits

Your Duramax truck relies on its transfer case to transfer power from the transmission to both front and rear axles through driveshafts. If your transfer case breaks or deteriorates, your four-wheel drive will suffer. Avoid a costly and annoying do-over by replacing it with this high-quality replacement 261XHD transfer case.

This direct replacement transfer case is perfect for 2001-2007 Duramax trucks with a factory 261XHD transfer case. Not only will it provide improved performance with upgraded parts, but it also includes a famous Merchant Automotive transfer case pump upgrade to eliminate pump rub. Plus, magnetic drain plugs are included to catch any debris in your oil and extend fluid life. And to top it off, you'll receive 64 oz. of MA performance transfer case oil for your install.

Part Number: 10603

• Direct Replacement 
• Upgrade From Factory
• Built To Resolve Pump Rub
• Includes MA Transfer Case Pump Upgrade
• Comes W/ Magnetic Drain Plug
• Includes MA Performance Transfer Case Oil

Included:

• 261XHD Transfer Case
• 64 oz. MA Performance Transfer Case Oil
• Transfer case adapter gasket
• RTV silicone w/ applicator nozzle
• Blue thread locker

• This is the manual shift 4WD lever on the floor transfer case. If you have the electronic push button 4WD on the dash, please use the 263XHD Transfer Case.

Parts Only

• 2-Year Unlimited Mileage Warranty
• LIMITED LIFETIME WARRANTY against pump rub. If you have this kit installed and your case wears a hold in the new rear housing, MA will buy you a new transfer case. This warranty will only apply to installations with a new rear housing.

Duramax Diesel Transfer Case Upgrade Kit

To repair or prevent pump rub failure on your Duramax diesel engine transfer case, use this MA Duramax transfer case upgrade kit with magnetic drain plugs and performance transfer case fluid. This kit will give you everything you need to help prevent future failures and can be installed as part of your repair to replace the affected parts and prevent future failures.  

Duramax Performance Transfer Case Fluid

At Merchant Automotive, they are all about increasing the performance of your Duramax vehicle. Here is how our performance transfer case oil can help your truck: 

• Promotes transfer case performance
• Increases shifting performance
• Dramatically reduces wear
• Increases component efficiency
• Blended specifically for use in GM transfer cases
• May be used in GM, Ford & Chrysler transfer cases
• For use in diesel or gas transfer case
• Cost-effective upgrade for Auto Track II
• Performs in manual or electric shift applications
• Reduces irritating drive shaft clunk
• Increases driveline performance by reducing clutch chatter
• Drastically reduces wear on internal components & seals 

One typical GM HD transfer case will require 2 quarts, so they have bottled up theri performance transfer case fluid in a convenient 2 quart bottle to provide you with a single fill with no waste. 

Duramax Magnetic Drain Plugs

The factory plugs on your Duramax transfer case are great and serve their purpose, however, there is always room for improvement. This kit features magnetic drain plugs for your transfer case to catch small metal debris that is suspended in the fluid. This not only prevents these harmful flakes of metal from making their way into the vital parts of your transfer case, but it also makes cleaning them off during every serving interval, very easy.

What Is Pump Rub?

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. The pump housing has tabs that fit into spots in the rear housing to locate the pump housing and prevent it from spinning inside the case with the mainshaft. Over time, these pump tabs can wear on the rear housing and start to wear on the aluminum pump housing causing a small leak. Due to the location of the leak, many vehicles do not experience dripping while parked, but rather while driving, leaving it gone unnoticed. The transfer case on these vehicles do not have a low fluid indicator, which means that by the time the problem is noticed, it is usually too late.

From the factory, GM installed a spring steel clip in the housing to prevent this type of wear, but this has proved to break and become useless in these situations.

With the installation of this transfer case repair/upgrade kit, you can prevent this before it happens and avoid costly repair bills.