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Transfer Case Pump Upgrade Kit - Magnetic Drain Plugs and Fluid | 1998-2007

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SKU: 10382
$113.94

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Description


The Merchant Automotive Transfer Case Pump Upgrade is the best upgrade you can perform on your 1998 to early-2007 GM transfer case by completely preventing the ever increasing problem of pump rub and catastrophic transfer case fluid loss. The kit can be installed proactively in a transfer case that has not yet succumb to a pump rub failure as a preventative maintenance measure. If your transfer case has already had a pump rub failure the MA Transfer Case Pump Upgrade can be installed as part of your repair to prevent future failure.

KIT INCLUDES: 

To view/download installation instructions click here.

To view the Merchant Automotive installation Video click here.

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

What is a Transfer Case "Pump Rub" Failure?


GM transfer cases used from 1998 through early 2007 use a gear pump inside the case that is driven off the mainshaft. The pump forces oil to the planetary as well as the drive sprocket sleeve. Because the pump is driven by the shaft, the housing of the pump must "float" in the rear housing. There are tabs around the pump housing 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, the pump tabs can start to wear on the rear housing. GM installed a spring steel clip in the housing intended to prevent wear, but the clip can break and be rendered useless.

Since the pump housing is aluminum and is a harder material then the magnesium rear housing, it can wear a hole in the rear housing and cause a very small leak. This leak is frequently high enough on the case that it typically will not leak when vehicle is not moving and therefore not leaving any drops on the ground; it will however leak while the vehicle is in motion. Unfortunately since the transfer case does not have a low fluid indicator the pump rub failure is often not found until there is transfer case damage from running the case out of fluid.

Avoid costly repairs to your transfer case by preventing "Pump Rub" by installing a Merchant Automotive Transfer Case Pump Upgrade kit in your transfer case today, before it happens to your vehicle.

With installation of this kit, you will have a LIMITED LIFETIME WARRANTY against pump rub. If your case ever wears a hole in the new rear housing with the upgrade installed. We will buy you a new transfer case. However, if you already have a hole in your case, we recommend installing a new rear housing for a complete repair. The MA Lifetime Warranty will only apply to installations with a new rear housing.


FAQ:

What do I do with the OEM anti rattle clip when installing this upgrade?

Discard the factory clip during installation of the MA Transfer Case Pump Upgrade kit. It's been designed and precision machined to work with the clip removed.

What other parts will I need to install this upgrade kit?

We tried to make the kit all inclusive for a basic installation when it is being installed as preventative measure. If it's being installed as part of a repair or after pump rub has occurred, there is no real way to know the extent of the damage inside the case until it is completely disassembled. In many instances, as long as the case has not run out of fluid, it can be repaired with a new rear housing and seal and prevented from ever happening again using the upgrade kit. Regardless of the reason for installing this upgrade, you will need to refill the transfer case with the Merchant Automotive Performance Transfer Case Fluid included in this kit for excellent lubrication and performance. Be sure to replace your original drain and fill plugs with the Merchant Automotive Magnetic Drain Plug kit also included with this kit as an additional layer of protection to catch metal debris from the fluid circulating inside the transfer case as well as replacing the factory plugs which are often rounded off or damaged.

I hear a grinding noise at low speed after installing the kit. What could that be?

A low speed grinding noise is most commonly caused by the rear output bearing snap ring not being fully seated causing the bearing to move out of proper alignment. Verify that the snap ring is fully engaged and properly seated in the rear housing and the locating groove in the bearing.

What would cause a speed sensor correlation code after installing this upgrade?

A speed sensor correlation code is often accompanied by a low speed grinding noise and is frequently caused by the rear output bearing snap ring not being fully seated causing the bearing to move out of proper alignment. Verify that the snap ring it fully engaged and properly seated in the rear housing and the locating groove in the bearing.

Application


YEAR 
VEHICLE
CHASSIS 
TRANSFER CASE MODEL NUMBER 
1998-2007
SILVERADO/SIERRA
1500, 1500HD, 2500, 2500HD, 3500
NP246, NP261HD, NP263HD, NP261XHD, NP263XHD
1998-2003
BLAZER/JIMMY
-
NP236
1999-2005
ASTRO/SAFARI
-
NP136
1999-2007
ESCALADE
-
NP246, NP149
2002-2007
AVALANCHE
1500, 2500
NP246, NP261, NP263, NP263HD
1998-2007
SUBURBAN/YUKON XL
TAHOE/YUKON

1500, 2500
NP246

2500HD 3500 Silverado Sierra 6.6L V8 Duramax diesel engines:

LB7, LLY, LBZ


Years

 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, early 2007


NOTE: This upgrade kit 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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