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10603 Merchant Automotive Transfer Case - GMC/Chevy 6.6L Duramax 2001-2007

SKU: MA10603
Mftr. Part#: 10603
Manufacturer: Merchant Automotive
Merchant Automotive upgraded this Transfer Case to improve the performance and prevent future problems on your 2001-2007 GMC/Chevy 6.6L Duramax truck.

PRODUCT DETAILS (click to expand)

Mftr. Part#10603
Weight (lbs.):89.00 lbs.
Dimensions:12.00" x 12.00" x 20.00"

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
Truck Type/ModelDuramax
BrandMerchant Automotive
Product TypeTransfer Case


The Merchant Automotive Transfer Case is an upgraded replacement for your 2001-2007 GMC/Chevy 6.6L Duramax LB7/LLY/LBZ 2500/3500 truck. Built for increased durability and reliability, Merchant has addressed common failure items in the factory case.

The GMC transfer case uses a gear pump inside the case that is driven off the main shaft, this pump forces oil to the planetary as well as the drive sprocket sleeve. The 5 tabs around the housing fit into the spots in the rear housing are what positions the pump. Over time, the pump can start to wear on the rear housing, which is commonly referred to as pump rub. Each transfer case includes the Merchant Auto pump upgrade to alleviate these issues.

Help extend fluid life and the life of your transfer case with the magnetic drain plug. The drain plug catches debris instead of letting it circulate around. This kit includes a fill plug made of high strength corrosion resistant stainless steel.

The included Merchant Transfer Case oil is specially formulated for your Duramax truck to reduce wear, increase shifting performance, increase component efficiency, and increase driveline performance.


  • New 261XHD Transfer case
  • Upgraded for durability & reliability
  • Includes transfer case pump rub fix
  • Includes Merchant transfer case oil
  • Magnetic drain plug
  • For trucks with push-button transfer case operation
  • Transfer cases will not be filled when shipped, each unit will use 64 fl oz (2 quartz)
  • Encoder motor is not included