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    Mishimoto 11-14 Chevrolet / GMC 6.6L Duramax (LML) Transmission Cooler

    Vendor: Mishimoto
    SKU: MISMMTC-DMAX-11SL
    Regular Price $549.00
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    There's no greater enemy for a transmission than heat. Whether your 2011-2014 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 2011-2014 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 41-percent greater core volume, and 73-percent greater fin surface area than the stock 2011-2014 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
    2011-2014 Chevrolet Silverado 2500 HD LT
    2011-2014 Chevrolet Silverado 2500 HD LTZ
    2011-2014 Chevrolet Silverado 2500 HD WT
    2011-2014 Chevrolet Silverado 3500 HD LT
    2011-2014 Chevrolet Silverado 3500 HD LTZ
    2011-2014 Chevrolet Silverado 3500 HD WT
    2011-2014 GMC Sierra 2500 HD Denali
    2011-2014 GMC Sierra 2500 HD SLE
    2011-2014 GMC Sierra 2500 HD SLT
    2011-2014 GMC Sierra 2500 HD WT
    2011-2014 GMC Sierra 3500 HD Denali
    2011-2014 GMC Sierra 3500 HD SLE
    2011-2014 GMC Sierra 3500 HD SLT
    2011-2014 GMC Sierra 3500 HD WT
    Shipping Policy

    Cancellations

    Once an order is placed, in most cases it cannot be cancelled as they are sent for fulfillment almost immediately after receiving the order. If there is an ability to cancel the order, the buyer is responsible for the transaction fees charged from the transaction.

    Processing Time

    In-stock orders are typically processed and shipped within 1–2 business days of receiving payment, unless otherwise stated on the product page. Orders placed on weekends or holidays will be processed on the next business day.

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    Return Policy

    Return Period

    You have up to 30 days from the date of purchase to return eligible items.

    Condition of the Item

    A 20% restocking fee will apply to cover inspection, processing, and repackaging costs.

    Items must be returned in new, unused condition and include all original packaging, hardware, and documentation.

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    Before returning any item, please contact our customer service team to obtain a Return Merchandise Authorization (RMA) number. Items returned without an RMA may not be accepted.

    Refund Processing

    Once the returned item is received and inspected, we will initiate the refund process. Please allow 2–5 days for the refund to be processed and credited to the original payment method. Bank processing times may vary.

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    If you receive a damaged, defective, or incorrect item, contact us immediately for assistance. We’ll work quickly to resolve the issue or send a replacement.

    Final Sale Items

    Certain items may be marked as Final Sale and are not eligible for return or exchange. These will be clearly noted on the product page.

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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