Merchant Automotive Merchant Automotive Transfer Case Pump Upgrade Kit | 1998-2007


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Merchant Automotive Transfer Case Pump Upgrade Kit | 1998-2007
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Duramax Diesel Transfer Case Upgrade Kit 
To repair or prevent pump rub failure on your Duramax diesel engine transfer case, use this Merchant Automotive Duramax transfer case upgrade kit. 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. 

In this kit you will receive a Merchant Automotive T-6061 Aluminum CNC-Machined transfer case pump housing to replace your factory housing, transfer case adapter gasket, RTV silicone w/ applicator nozzle, and blue threadlocker.

To view/download Pump Upgrade installation instructions click here.


To view the Merchant Automotive Pump Upgrade installation video click here.


To view the Truck U segment on the Merchant Automotive Transfer Case Pump Rub kit click here.


  •  Prevents Pump Rub Failure 
  • Can Be Used To Help Repair Previous Pump Rub Failure 
  • Stronger Replacement Components 


  • Aluminum Housing Replaces Old Housing 
  • Includes Install Components 
  • High-Quality Components 

What's In The Box 

  • Merchant Automotive t-6061 Aluminum CNC-Machined 
  • Transfer Case Pump Housing Transfer Case Adapter Gasket 
  • RTV Silicone w/ Applicator Nozzle 
  • Blue Threadlocker 

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. You will also get a LIMITED LIFETIME WARRANTY against pump rub. If you have this kit installed and your case wears a hold in the new rear housing, we will buy you a new transfer case. This warranty will only apply to installations with a new rear housing. 

NOTE: This upgrade kit is designed to work with OE Magnesium case halves and MAY NOT BE COMPATIBLE with some aftermarket aluminum rear transfer case halves due to the inconsistent manufacturing tolerances seen in them, verify correct fitment prior to installation.

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