Thanks for contacting us! We'll get back to you as soon as possible

Mishimoto 2017-2019 GM 6.6L Duramax (L5P) Transmission Cooler - Silver product view

}

Mishimoto MMTC-DMAX-17SL installed angle on vehicle

}

Mishimoto 2017-2019 GM 6.6L Duramax (L5P) Transmission Cooler - Silver core and end tank detail

}

Mishimoto 2017-2019 GM 6.6L Duramax (L5P) Transmission Cooler - Silver

Ask an expert

Brand: MishimotoSKU / Part #: MISMMTC-DMAX-17SL

Regular price: $499.95
Regular price: ~~$550.00~~
Sale price: $499.95
Unit price: per

Apply at checkout

Subtotal: $499.95

Quantity:

Mishimoto 2017-2019 GM 6.6L Duramax (L5P) Transmission Cooler - Silver

Subtotal: $499.95

Not sure it fits? Text us your VINSee all fitment

Questions before you buy? Talk to a specialist.

Fitment and product questions · 9am–6pm Pacific

Call(310) 231-0292 Text(310) 886-3111 ChatLive chat

Price match: found it cheaper?
Secure checkout · Shop Pay · Affirm
AutoTalent since 2006

Free Shipping

Free standard shipping on orders over $99

Coupon Code on First Order

Price Match Guarantee

Free shipping on $99+ order

30-days Returns

Overview

This Mishimoto performance cooler is a direct-fit upgrade for 2017-2019 Chevrolet applications covering Silverado 2500 HD, Silverado 3500 HD. It replaces the weak points of the stock part with stronger materials and better flow or cooling so heat, boost and abuse stay under control on street and track duty. AutoTalent lists verified US-market fitment in the table below.

Why upgrade

There's no greater enemy for a transmission than heat. Whether your 2017-2019 Chevy/GMC 6.6L L5P 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. Mishimoto engineers these kits around real chassis packaging, so hoses, coolers and adapters line up without fabrication on the listed years. Follow the published torque specs and install guide, reuse sensors where instructed, and confirm clearances if you run other supporting mods. Every unit ships with the Mishimoto Lifetime Warranty for as long as you own it.

Features

Direct-fit for all 2017-2019 Chevrolet/GMC with Allison transmission (L5P)
Stacked-plate construction for maximum durability and superior cooling
CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
67-percent greater core volume than stock cooler
164-percent greater external fin surface area over stock cooler
Includes durable SAE J1532 hose designed specifically for use with transmission fluid
Mishimoto Lifetime Warranty

What's Included

Mishimoto Stacked Plate Transmission Cooler
CNC-Machined Quick-Disconnect to Hose Barb Adapters
Stock-style Quick-Disconnect Fittings
Transmission Hoses
Air Temperature Sensor Relocation Bracket
Mounting Brackets
Worm Gear Clamps
Mounting Hardware
Mishimoto Lifetime Warranty

Specifications

Part number	MMTC-DMAX-17SL
Brand	Mishimoto
Type	cooler
Engine codes	6.6L Duramax
Chassis codes	L5P
Shipping dimensions	34.7 x 11 x 4.5 in (88.1 x 27.9 x 11.4 cm)
Shipping weight	10 lb (4.5 kg)

Fitment Notes

Verified against Mishimoto US applications and dealer listing for 2017-2019 (2 rows). Years extended to 2027 where the US model remains in production.

Vehicle Fitment

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.
Year	Make	Model	Chassis	Engine
2017-2019	Chevrolet	Silverado 2500 HD	GMT800/900	—
2017-2019	Chevrolet	Silverado 3500 HD	GMT800/900	—

Fitment

Year	Make	Model

Not sure? Text us your VIN and we’ll confirm.

Shipping & returns

Shipping: Orders ship via UPS, FedEx or USPS, from our facility near Los Angeles or directly from the manufacturer. Rates for many items are weight-based and shown at checkout. If you need it by a certain date, text us before you order.

Returns: Unused items in brand-new condition and original packaging can be returned within 30 days of the invoice date, with a 25% restocking fee unless otherwise specified. In some cases we can offer a lower fee with the balance as store credit. Shipping charges aren't refundable in either direction unless approved by AutoTalent.

Not returnable: special-order or custom items, and anything that has been installed, modified or altered.

Cancellations: free if the item is out of stock or we miss the ETA you agreed to. Other cancellations carry a 5% processing fee to cover card fees we can't recover. Special-order items can't be cancelled.

Damaged in transit? Report it to the carrier and to us within 48 hours, keep all packaging, and don't send anything back without our written approval.

Reviews & questions