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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
4.4 ★★★★★
Based on 404 reviews
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Product Reviews
★★★★★ 4
It's more than golf shirt.
Color: Grey, Size: Large
This shirt is great for summer, beach, casual wear and outdoor activities. It's cool to touch and dry quick. The only thing you should be aware is that if you are on the plus size, the shirt does stick to your body sometimes and it does not compliment your body type well.
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Soft and Easy Care
Color: Turquoise, Size: Medium, Color: Turquoise, Size: Medium
This is a great lightweight and moisture wicking golf shirt. The color is pretty and it has a UPF rating of 30+. The fabric has a soft, luxurious feel and the fit is true to size. The snaps fasten easily and are of good quality. This shirt washed up easily with no need for ironing. A nice shirt at a great price!
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Reviewed in the United States on May 18, 2026
★★★★★ 3
Almost perfection
Color: Khaki, Size: XX-Large
I have really liked this polo the fit is great material is so lightweight and breathable Chef's kiss. the one thing i didn't like is the white accent parts are like heat applied and peeled off after 2 washes it doesn't do anything to the polo but still a little disappointing i just peeled the rest of them off so quality leaves a little bit to be desired there. i wish they didn't include them and it would be 5/5 for me but if after 4 or 5 wears and 2 washes it peels off that is a little disappointing
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Reviewed in the United States on May 17, 2026
★★★★★ 5
This Shirt Is So Cozy My Husband Loves It — Perfect Fit and Style!
Color: Turquoise, Size: X-Large
I recently picked up the Alex Vando Men’s Golf Shirt, and I have to say, it has quickly become one of my husband’s favorites in his wardrobe. From the moment he tried it on, he raved about how soft and comfortable it feels. The material is lightweight and breathable, yet it doesn’t feel flimsy — it strikes the perfect balance for both everyday wear and active use.
The moisture-wicking and quick-dry properties are a game-changer. He’s worn it for golf, casual outings, and even on warmer days, and it keeps him cool and dry without sticking uncomfortably. The UPF30+ is an added bonus for sunny days outside, giving some extra peace of mind during golf or tennis sessions.
What I really love — and what he notices — is the attention to detail. The 3D checkered texture gives the shirt a subtle, sophisticated look that feels premium. The color-matched snap buttons are secure and easy to use, and the fine line detailing along the placket adds a touch of depth. The side panels and slit hem make movement easy, so he doesn’t feel restricted during activities. It’s clear this shirt is designed with both style and performance in mind.
Fit-wise, it’s fantastic. It flatters his physique without feeling tight, giving a clean, streamlined look. He’s worn other golf polos before that were either too stiff or too loose, but this one hits the sweet spot perfectly.
Another huge plus is the practicality. This shirt is wrinkle-resistant and washes beautifully, requiring no ironing. That makes it perfect for busy days when he wants to look sharp without extra effort.
Overall, the Alex Vando Men’s Golf Shirt is a winner. It’s stylish enough for business casual, functional enough for sports, and incredibly comfortable for everyday wear. My husband loves it, and I’ve already noticed him reaching for it again and again. If you’re looking for a high-quality, versatile polo that combines comfort, style, and performance, this is absolutely worth trying.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
Good
Color: Teal, Size: XX-Large
"I highly recommend this purchase. The product's quality and performance have fully met my expectations."
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 4, 2026
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