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Description
Merchant Automotive 10001 Transfer Case Pump Upgrade KitThe Merchant Automotive 10001 Transfer Case Pump Upgrade Kit 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
The Merchant Automotive 10001 Transfer Case Pump Upgrade Kit 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
- Merchant Automotive sticker
If you already have a hole in your case, its recommended to install a new rear housing for a proper repair. Lifetime warranty will only apply to installations with a new rear housing.
|
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 23 reviews
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Product Reviews
★★★★★ 4
Very solid option for comfort but the pattern of the shirt I received was off-putting
Size: Small, Color: Grey White Stripe
The shirt itself is great, sizing is spot on with an athletic tapered fit which I always prefer in a polo. The material is classic maelreg cotton feeling without the heaviness and water holding of typical cotton shirts. You can run in these polos, workout, go out to lunch or dinner, or simply sleep in these they are so comfortable. It's the patterns offered that made me return this and another I tried out. Colors are spot on with descriptions but the patters are small enough to play tricks on eyes, I received complaints from both my wife and daughter (separately) about the pattern hurting their eyes hence the 4 star instead of 5. Others may love the patter but know that it isn't as universally pleasing as more other shirts offered by this brand
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Good
Size: Medium, Color: Navy Stripe
Good, soft material
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
★★★★★ 5
Comfortable, and good quality
Size: X-Large, Color: Cobalt Stripe
Nice quality for the $
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026
★★★★★ 5
Looks decent, doesn’t cook me in summer
Size: Medium, Color: Grey White Stripe
Bought this mainly as another golf shirt and wasn’t expecting much. Material is lightweight and comfortable enough during warmer days. Fit was pretty close to expected sizing.
Sometimes inexpensive golf shirts end up feeling stiff or cheap after washing. This one has held up fine so far. Good everyday option.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Most Comfortable Hoodie I’ve Ever Worn…
Color: White Light Blue Grid, Size: Medium, Color: White Light Blue Grid, Size: Medium
Arguably, this is one of the most comfortable hoodies I’ve ever worn—and that’s saying something. The fit, feel, and overall look just come together in a way that makes this an easy go-to.
I’ve become a big fan of M MAELREG, and this hoodie continues that trend. Their focus on clean, sharp styling really shows here. It has a modern, athletic look without trying too hard, and it works just as well for casual wear as it does for something a bit more put together. My wife immediately noticed it—and that’s always a good sign.
The standout feature is the fabric. It’s lightweight but not flimsy, with just the right amount of structure. The stretch is excellent, and it moves naturally without feeling restrictive. It also does a great job managing heat, which is a big deal here in Arizona. Whether I’m out running errands, heading to a showing, or just wearing it around the house, it stays comfortable and breathable.
Another thing I appreciate is how versatile it is. This isn’t just a “gym hoodie” or something you only wear lounging—it genuinely fits in almost anywhere. It has that polished, performance look that makes it easy to dress up or down depending on the situation.
At roughly $40, this feels like a strong value. You’re getting a well-designed, comfortable piece that looks good and performs even better.
Final thoughts….
✔️ Extremely comfortable with a lightweight, performance feel.
✔️ Clean, modern design that looks sharp in multiple settings.
✔️ Breathable and well-suited for warmer climates like Arizona.
✔️ Great stretch and mobility without feeling too thin.
✔️ Strong value for the price point.
⭐️1 star — I don't endorse this at all, poor quality.
⭐️⭐️ 2 stars — I don't endorse it: has multiple faults, or significantly overpriced.
⭐️⭐️⭐️ 3 stars — It's passable: it has some faults, some compromises, but the quality is acceptable for what it is.
⭐️⭐️⭐️⭐️ 4 stars — Product quite acceptable, and it does what it promises.
⭐️⭐️⭐️⭐️⭐️ 5 stars — Product that I totally endorse. Blown away. Drop everything and buy it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
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