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

The Merchant Automotive Transfer Case Pump Upgrade Kit with Magnetic Drain Plugs and Fluid is designed to prevent and repair pump rub failure on 1998-early 2007 GM transfer cases, including the NP261XHD and NP263XHD used in 2001-2007 Chevy Silverado and GMC Sierra 2500HD and 3500HD trucks with the 6.6L Duramax diesel (LB7, LLY and LBZ), and the NP261HD, NP263HD, NP261XHD and NP263XHD used in 2001-2007 2500HD and 3500HD gas trucks. It combines our Transfer Case Pump Upgrade Kit with our magnetic drain plug kit and 2 quarts of our performance transfer case fluid, so you have what you need to install the upgrade and refill the case.

Note: This kit may not be compatible with some aftermarket aluminum rear transfer case halves due to inconsistent manufacturing tolerances. Verify fitment before installation.

Features

• Merchant Automotive T-6061 aluminum CNC machined transfer case pump housing
• Includes the gasket, RTV silicone and threadlocker for installation
• Magnetic drain plug and fill plug, made from 304 stainless steel
• 2 quarts of Merchant Automotive Performance Transfer Case Fluid
• Limited lifetime warranty against pump rub

What's Included

• (1) Merchant Automotive Transfer Case Pump Upgrade Kit (10001), which includes:
  • T-6061 aluminum CNC machined transfer case pump housing
  • Transfer case to transmission adapter gasket
  • RTV silicone with applicator nozzle
  • Blue threadlocker
• (1) Merchant Automotive Transfer Case Magnetic Drain Plug Kit (10185): magnetic drain plug and fill plug, 304 stainless steel
• (1) Merchant Automotive Performance Transfer Case Fluid, 2 Qt (10193)

What is Pump Rub?

GM transfer cases from 1998 through early 2007 use a gear pump that is driven by the mainshaft and floats in the rear housing, held in position by tabs. Over time, the harder aluminum pump housing can wear through the softer magnesium rear housing and cause a small leak. The leak is often too slight to drip when the truck is parked, so it can go unnoticed until the case has run low on fluid and been damaged. GM's spring steel clip, meant to prevent this wear, can break. This kit replaces the factory pump housing with our upgraded housing and comes with a limited lifetime warranty against pump rub.

Before You Order

• Repairing a damaged case? If the rear housing already has a hole from pump rub, you will also need a new rear housing. See the 261XHD/263XHD Rear Transfer Case Housing or the 246/261HD/263HD Rear Case Half.
• Aftermarket aluminum rear halves: this kit may not fit some aftermarket aluminum rear housings. Verify fitment before installation.

Installation Tips

• Discard the OEM anti rattle clip during installation.
• The drain and fill plugs use pipe threads. Tighten them snug only, with new Teflon sealing tape on the threads each time they are installed.
• After reassembly, make sure the rear output bearing snap ring is fully seated.

Installation Resources

• Mechanics Minute: Transfer Case Pump Upgrade Install (Merchant Automotive YouTube)
• Product Spotlight: Performance Transfer Case Oil (Merchant Automotive YouTube)
• Merchant Auto Pump Upgrade Installation Instructions (PDF)

Related Parts

• Rear Transfer Case Housing with Output Seal, 261XHD/263XHD
• Rear Transfer Case Half, 246/261HD/263HD
• Transfer Case Housing Bolt Kit
• Transfer Case to Transmission Mounting Nut Kit

Frequently Asked Questions

What do I do with the OEM anti rattle clip?
Discard the factory clip during installation.

Will I need additional parts?
The kit covers a preventative install. For repairs, additional parts may be needed depending on the damage.

I hear a grinding noise after installation. What could that be?
Check that the rear output bearing snap ring is fully seated.

What would cause a speed sensor correlation code after installation?
This is also commonly caused by the rear output bearing snap ring not being fully seated.

For warranty information, see our Warranty Policy.