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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21
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Description
Mishimoto 03-05 Chevrolet / GMC 6.6L Duramax (LB7/LLY) Transmission CoolerThere's no greater enemy for a transmission than heat. Whether your 2003 2005 Chevy GMC 6. 6L Duramax is a dedicated tow vehicle, hardworking fleet truck, or a daily driver with a liking for the drag strip, you need to ensure that your transmission runs cool. Luckily, Mishimoto has developed a direct fit transmission cooler to do just that. Our 2003 2005 Chevy GMC 6. 6L Duramax transmission cooler utilizes a stacked plate design for maximum durability
There's no greater enemy for a transmission than heat. Whether your 2003-2005 Chevy/GMC 6.6L Duramax is a dedicated tow vehicle, hardworking fleet truck, or a daily driver with a liking for the drag-strip, you need to ensure that your transmission runs cool. Luckily, Mishimoto has developed a direct-fit transmission cooler to do just that. Our 2003-2005 Chevy/GMC 6.6L Duramax transmission cooler utilizes a stacked-plate design for maximum durability and powerful cooling. Aside from It's durable construction, this transmission cooler is significantly larger than the stock core. The Mishimoto transmission cooler boasts a 174-percent greater core volume, and 192-percent greater fin surface area than the stock 2003-2005 Duramax transmission cooler. The included CNC-machined adapters connect directly to the stock transmission cooler lines for leak-free cooling. Direct-fit brackets and tailor-made hoses make installation easy. Like all Mishimoto products, this transmission cooler is backed up by our Lifetime Warranty with Accident Protection for worry free cooling as long as you own it.This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2005 | Chevrolet | Silverado 2500 HD | Base |
| 2003-2005 | Chevrolet | Silverado 2500 HD | LS |
| 2003-2005 | Chevrolet | Silverado 2500 HD | LT |
| 2003-2005 | Chevrolet | Silverado 2500 HD | WT |
| 2003-2005 | Chevrolet | Silverado 3500 | Base |
| 2003-2005 | Chevrolet | Silverado 3500 | LS |
| 2003-2005 | Chevrolet | Silverado 3500 | LT |
| 2004 | Chevrolet | Silverado 3500 | WT |
| 2003-2005 | GMC | Sierra 2500 HD | Base |
| 2003-2005 | GMC | Sierra 2500 HD | SLE |
| 2003-2005 | GMC | Sierra 2500 HD | SLT |
| 2003-2005 | GMC | Sierra 2500 HD | WT |
| 2003-2005 | GMC | Sierra 3500 | Base |
| 2003-2005 | GMC | Sierra 3500 | SLE |
| 2003-2005 | GMC | Sierra 3500 | SLT |
| 2004-2005 | GMC | Sierra 3500 | WT |
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
4.8 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 5
Great fit
Size: 3T, Color: Light Grey Heather
Very soft and great material. Stretchier than expected. Fit was great
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Reviewed in the United States on May 2, 2026
★★★★★ 3
Size up
Size: Small, Color: Black
Overall a good hoodie. Thin-ish to medium weight, but don’t expect heavy weight. It’s soft but of course since it’s on more on the thin side it loses its softness quick but for the price it’s good. It’s good to cricut heat transfer on.
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Reviewed in the United States on January 19, 2026
★★★★★ 5
Nice and heavy
Size: Small, Color: Dark Green
Nice quality, heavyweight. My child wears this all the time, it’s really nice.
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Reviewed in the United States on May 24, 2026
★★★★★ 1
Size is wayyyyy off
Size: X-Large, Color: Black
Super small ain’t no way this is an X-Large
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Great shirt for the price.
Material Type: Recycled Polyester, Color: Electric Blue, Size: Large
Bought this for my son. Very nice shirt for the price, it is true to size and the color is the same as the picture. Would definitely buy it again. The material is good quality. No issues whatsoever
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Reviewed in the United States on May 19, 2026