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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.
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- Standard Shipping : 3-10 business days
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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
4.0 ★★★★★
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★★★★★ 5
Amazing service
Amazing service. Very easy to use. Will purchase again.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Fantastic Insurance
If you doubt getting this insurance, DON’T!!! Ausurion delivers 5star coverage and their customer service support is wonderful. Absolutely would recommend
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Full Refund on Vacuum
I purchased the 3 year plan for my robotic vacuum. It stopped working at about the 1 year point. Went to their site, printed the prepaid label, dropped it off at UPS store near me. The sent an email letting me know they received the vacuum, then another email that they were trying to repair it, then another email about two weeks after I mailed it letting me know that a gift card for the full amount would be issued via email to mail as they could not repair it. Took the gift card credit on amazon and purchased a different vacuum. I bought the insurance again, it is worth it!
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Reviewed in the United States on June 13, 2024
★★★★★ 5
No problem at all
I purchased a warranty on my vaccum cleaner and it was not picking up when I ran it like it always had. The head part was squeaking and hard to run. I filed a claim they sent me a label we boxed it up and sent it in. They sent emails letting me know when they got it and it was being worked on, Then we it was done they emailed me also, It runs like a new one I am very pleased and so glad I purchased the warranty. Well worth the price for the value!
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Reviewed in the United States on June 17, 2024
★★★★★ 4
IRobot Roomba 3 year warranty
My roomba stopped working as it should. It took two claims to get things taken care of but at the end, I was given a gift card for the original purchase price, which I used to buy a brand new roomba. 😁 so im satisfied and purchased another warranty for the new one.
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Reviewed in the United States on February 2, 2026