Fits: 2001 thru 2007 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY/LBZ Duramax Diesel

Upgrade your GM transfer case to avoid the increasingly common issue of pump rub. This critical enhancement ensures the longevity and reliability of your vehicle's transfer case, protecting it from potential damage and costly repairs. This kit is compatible with GM transfer cases 261XHD (Manual Shift) and 263XHD (Electronic Shift). 

What is Pump Rub?

GM transfer cases feature a pump cover inside the case, driven by the main shaft. This pump circulates oil to the planetary gears and the drive sprocket sleeve. Since the pump is shaft-driven, its housing must "float" within the rear housing, guided by five tabs that fit into designated spots. Over time, the pump can wear against the rear housing. GM installed a spring steel clip in the housing to prevent this wear, but the clip can break and become ineffective.

As the pump housing is made of Magnesium, which is a soft metal, it can eventually wear a hole in the rear housing, causing a small leak. This leak typically occurs high enough in the case that it won't be noticeable when the vehicle is stationary, leaving no drops on the ground. Often, the issue is only discovered after the transfer case sustains damage from running out of fluid.

Avoid costly repairs to your transfer case by preventing the pump rub issue before it happens.

How to Prevent Pump Rub

Pump Rub is preventable if you catch it early enough. There are a few paths that you can navigate when addressing this common issue.

The first is to upgrade the GM internal pump cover using DmaxStore's Transfer Case Upgrade Kit. Within this kit, we have machined our own Billet T6-6061 Aluminum pump cover with a far superior design than any OEM replacement. DmaxStore took note of the thin OEM tangs on the stock pump cover and designed one that has much larger tangs. For reference, the width of the OEM tangs is approximately 2.1mm, and the DmaxStore replacement pump cover has tangs that are 15.24mm. This design ensures that there are no cutting patterns in the transfer case when it is operational since there is more surface area being covered within the pump cover housing.

The second way to fix this issue is to replace the back half of the transfer case. There will come a point when the damage to the transfer is too severe, and the only option is to replace it. Fortunately, we offer our Dmax XD Rear Transfer Case Housing, which is constructed of Aluminum, a much stronger metal than magnesium. If you decide to pursue this option, you are only upgrading the back half of the transfer case to sustain the harsh vibrations of the stock pump cover. Don't worry, it can take it. It is also important to note that if you upgrade the back half of the transfer case, there is no need to opt for the DmaxStore Transfer Case Upgrade Kit because our pump cover is intended to be a fix for the magnesium housing. However, if you truly want to upgrade to the Aluminum back half and use the DmaxStore pump cover you absolutely can.

Finally, the most costly option is to replace the entire transfer case. This tends to happen only when there is too much damage sustained to the transfer case from being operated with suboptimal fluid levels. If you need a full transfer case, we also offer our DMAX XD Remanufactured Transfer Case. This is a last resort as there is no saving the internals of the transfer case. So, look at your transfer case today and determine if you have pump rub. Whether you do or not, acting fast is important to save time and money. 

Features: 

• Prevents Pump Rub Issue
• Made in the USA
• Comes as a complete kit
• T6-6061 Aluminum Construction

Includes: 

• In the Kit
  • Dmaxstore billet transfer case pump housing 
  • Transfer case adapter gasket
  • RTV Silicone
• Optional Add Ons 
  • (#TRANSYND688) - 1 Gallon of Transynd Transmission Fluid
  • (#XD-2049) - DMAX XD Transfer Case Rear Output Shaft Seal
  • (#12478093) - GM Transfer Case Rear Output Shaft Seal