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Description
Merchant Automotive 10381 Transfer Case Upgrade with Drain PlugsThe Merchant Automotive 10381 Transfer Case Upgrade with Drain Plugs for your 01 07 GM 6. 6L Duramax is the best upgrade you can make to your GM transfer case (model 136, 146, 246, 261, 261HD, 263HD, 263XHD, 261XHD) to prevent the ever increasing problem of pump rub. What is pump rub? The GM transfer cases 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.
The Merchant Automotive 10381 Transfer Case Upgrade with Drain Plugs for your 01-07 GM 6.6L Duramax is the best upgrade you can make to your GM transfer case (model 136, 146, 246, 261, 261HD, 263HD, 263XHD, 261XHD) to prevent the ever increasing problem of pump rub.What is pump rub?
The GM transfer cases 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 5 tabs around the housing that fit into spots in the rear housing to position the pump. Over time, the pump 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 render useless
Being that 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 high enough in the case that it typically will not leak when vehicle is not moving and therefore not leaving any drops on the ground. Typically the condition is not found until there is transfer case damage from running the case out of fluid.With installation of this kit, you will have a LIMITED LIFETIME WARRANTY against pump rub.
Included Components:
- Merchant Automotive billet transfer case pump housing
- Transfer case adapter gasket at trans
- RTV Silicone
- Blue Threadlock
- Magnetic Drain Plugs
- Merchant Automotive sticker
|
Application Guide |
||
|
Year |
Model |
Transfer Case Model Number |
|
1998-2007 |
GM 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/Tahoe/Yukon XL 1500/2500 |
NP246 |
Frequently Asked Questions:
What do I do with the OEM anti rattle clip when installing this upgrade?
You can discard the factory clip during installation of this kit. Its been designed 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. This is taking into consideration of course that its being installed as preventative measures. If its 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 torn down. Most times, as long as the case has not run out of fluid, it can usually 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 oil. We recommend our Performance Transfer Case Oil for use in ALL transfer cases.
WARRANTY INFO:
Lifetime
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 2
Not very durable
Color: Blue Puppy, Size: Medium Size 2
This ball is cute and my dog loves tags. However he popped this ball with one bite to carry it…. Within 10 minutes of getting it. It should have a tougher exterior
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 25, 2025
★★★★★ 5
Perfect for Blind Dogs, Fun and Durable
Size: 2-pack, Style: Duo
My blind dog loves these Chuckit! sniff balls. She can easily sniff them out and plays fetch with them for 20 minutes a day, even running up and down the stairs.
The balls are durable, bounce well, and the bacon and peanut butter scent keeps her engaged. I do wish Chuckit! would bring back the version with a tone so we could play fetch outside more easily.
Overall, a fantastic toy for dogs that rely on scent and a fun way to keep them active.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 14, 2026
★★★★★ 5
My Golden Loves
Size: 2-pack, Style: Duo
My 8 month old Golden Retriever loves these. It is also one of the few products she cannot destroy. They smell as described and she loves to chew them and play fetch when. She can chew these easily without destroying them. Overall good value for the money for my Golden
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 2, 2026
★★★★★ 5
My dogs are obsessed with this ball
Size: 2-pack, Style: Duo
Great quality! I have 2 boxers that love it and the ball is still intact
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 31, 2026
★★★★★ 5
Not Scented, but Dog Approved
Size: 2-pack, Style: Duo
They don't smell like peanut butter or bacon. But our dogs still love them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 31, 2025
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