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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 |
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4.2 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Sturdy disposable plates that handle real meals without getting soggy
Color: Brown, Size: 9 in - 75 count, Color: Brown, Size: 9 in - 75 count
These 9-inch compostable plates are a great option when you want the convenience of disposable plates without the flimsy feel of standard paper ones. The bagasse material gives them a much sturdier structure, so they hold up well even with heavier foods.
What I noticed right away is that they do not bend or soak through easily. Foods with sauces, oils, or moisture sit on the plate without making it soft or soggy. Plates made from sugarcane fiber are designed to resist grease and liquids better than typical paper plates while still being biodegradable. 
The 9-inch size works well for full meals, not just snacks. I have used them for things like pasta, barbecue, and salads, and they held up without needing to double stack plates. They also have a nice natural brown look that works well for casual gatherings, cookouts, or parties.
Another plus is the eco-friendly aspect. Bagasse plates are made from leftover sugarcane fibers, which makes them a renewable alternative to plastic or foam disposable plates.  It is nice to have something convenient that is also a little better for the environment.
Overall these are sturdy, practical disposable plates that actually feel durable enough for real meals. Great for parties, family gatherings, picnics, or anytime you want easy cleanup without using flimsy plates.
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Reviewed in the United States on March 16, 2026
★★★★★ 5
ACTUALLY heavy duty
Color: Brown, Size: 9 in - 75 count
These plates are actually better than I expected. I’ve used a lot of disposable plates that claim to be “heavy duty” and then immediately start bending the second you put real food on them, but these feel sturdier than the average cheap paper plate. The 9-inch size is a good everyday size too, big enough for a normal meal without feeling tiny, and I like the natural brown color because it looks a little nicer and less flimsy than plain white party plates. For cookouts, birthdays, quick dinners, or anything where I just do not want extra dishes, these have been really convenient.
What I like most is that they feel substantial without being overly thick or bulky. They hold up better than the thin paper plates that get soggy fast, and that matters a lot when there’s anything heavier or messier on them. I also like having a bigger pack on hand because disposable plates are one of those things that disappear faster than you think, especially with kids, parties, or just busy weeks. The compostable part is a nice bonus, but honestly what matters most to me is that they actually do the job and don’t feel like they’re going to fold in half in my hand.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
Great Value and Very Durable Plates
Color: Brown, Size: 10 in - 75 count
These plates are a great value for the price considering the quantity and the quality you get. Getting 75 plates at this price point is already a win, but the durability makes them even better.
They’re biodegradable, which is a nice bonus, and they’re definitely not flimsy. These plates are stiff and sturdy — I can load them up with a pretty heavy plate of food and they still hold up without bending.
They also do really well in the microwave, which makes them even more convenient for everyday use or parties.
Overall, a really solid disposable plate option that’s durable, eco-friendly, and a great value.
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Reviewed in the United States on March 11, 2026
★★★★★ 3
A bit iffy on these plates
Color: Brown, Size: 9 in - 75 count, Color: Brown, Size: 9 in - 75 count
These plates are ok, but certainly not the best I've found.
On the positive side, they are what I'd consider "Lunch Size" an are somewhat sturdy. They'll hold a sandwich and chips with little effort so, as a plate, they do... plate.
Where I am a bit hesitant is in their molding an construction. You can see in my photos that there is significant staining/watermarking on the plates from the manufacturing process. This could be simply from the way the wet pulp was extruded and formed, but it honestly gives me a bit of the ick. Not that it's particularly gross, but it does make me wonder how sanitary the plates are or what binders might be leeching into my food.
In my last photo, you can see a comparison to a compostable plate that I really like. The finish is cleaner and the mold included an inner ridge which gives the plate more stability - making it less likely to flex under weight. Both are sugar cane fiber plates and my preferred plate is a few dollars more expensive for a comparable pack, but the clean appearance and extra rigidity make it worth the added spend in my opinion.
Ranking these 3-stars might lead some to think they're bad - and to be clear, I don't think they are. They're just adequate. If you're looking to save a few bucks on a compostable plate, these WILL get the job done. I would just shy away from using them with wet or acidic foods since they don't boast the highest quality of manufacture.
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Reviewed in the United States on March 12, 2026
★★★★★ 4
Strong Eco Friendly Plates But Not Great For Hot Food
Color: Brown, Size: 9 in - 75 count
I picked these up because I wanted something more environmentally friendly than the usual plastic or paper stuff. They are made from bamboo and bagasse, and you get a good amount in the pack for the price. For dry stuff like snacks or sandwiches, they are super sturdy and do not bend at all when you pick them up. However, they do not hold up very well when you put hot or wet food on them. Even though they are supposed to be heavy duty, I noticed they can get a little soft if the food is really steaming. They are still perfect for a quick lunch or a party where you want an easy cleanup, but you might want to double them up if you are serving something heavy and hot. The plates are big, and you get quite a bit, making it a really good value overall.
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Reviewed in the United States on March 13, 2026