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Mishimoto 03-05 Chevrolet / GMC 6.6L Duramax (LB7/LLY) Transmission Cooler

SKU: MISMMTC-DMAX-03SL

Fluid Coolers

MM Transmission Coolers...

Mishimoto 03-05 Chevrolet / GMC 6.6L Duramax (LB7/LLY) Transmission Cooler

SKU: MISMMTC-DMAX-03SL

Fluid Coolers

MM Transmission Coolers...

A$1,155.63
IN STOCK! Est Ship 3-5 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

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.

Product Overview

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.


Features and Benefits

  • Direct-fit for all 2003-2005 Chevrolet/GMC 6.6L Duramax (LB7/LLY)
  • CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
  • 174-percent greater core volume than stock cooler
  • 192-percent greater external fin surface area over stock cooler
  • Mishimoto Lifetime Warranty

Product Details

Description:Mishimoto 03-05 Chevrolet / GMC 6.6L Duramax (LB7/LLY) Transmission Cooler
Install Difficulty:2
Part Number:misMMTC-DMAX-03SL
SellingPoint01:Direct-fit for all 2003-2005 Chevrolet/GMC 6.6L Duramax (LB7/LLY)
SellingPoint02:Stacked-plate construction for maximum durability and superior cooling
SellingPoint03:CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
SellingPoint04:174-percent greater core volume than stock cooler
SellingPoint05:192-percent greater external fin surface area over stock cooler
SellingPoint06:Patent numberD900,161
SellingPoint07:Mishimoto Lifetime Warranty
SellingPoint08:N/A
SellingPoint09:N/A
SellingPoint10:N/A
SellingPoint11:N/A
SellingPoint12:N/A
SellingPoint13:N/A
SellingPoint14:N/A
SellingPoint15:N/A
TechSpec Applications:N/A
TechSpec Caution:N/A
TechSpec Chassis Codes:LB7--LLY
TechSpec Core Construction:N/A
TechSpec Core Height (in):5.78
TechSpec Core Length (in):27.95
TechSpec Core Thickness (in):1.25
TechSpec Engine Codes:6.6L Duramax
TechSpec Fluid Capacity (qts):N/A
TechSpec Includes:Mishimoto Stacked Plate Transmission Cooler--CNC-Machined Quick-Disconnect to Hose Barb Adapters--Stock-style Quick-Disconnect Fittings--Transmission Hoses--Mounting Brackets--Worm Gear Clamps--Zip Tie--Mounting Hardware--Mishimoto Lifetime Warranty
TechSpec Inlet:N/A
TechSpec Installation Notes:N/A
TechSpec Note:This kit fits with late 2003 trucks with purple clips. Early 2003 trucks with orange clips should use MMTC-DMAX-01.
TechSpec Outlet:N/A
TechSpec Overall Height (in):N/A
TechSpec Overall Length (in):N/A
TechSpec Overall Width (in):N/A
TechSpec Rows:13

Part Type

Automatic Transmission Oil Cooler

Data: v4.2 - Upd: 2026-10-17 06:03:53

Features

  • CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
  • Direct-fit for all 2003-2005 Chevrolet/GMC with Allison transmission (LB7/LLY)
  • Stacked-plate construction for maximum durability and superior cooling

Specifications

Product Attributes - Brand
Mishimoto
Product Attributes - Manufacturer's Part Number
MMTC-DMAX-03SL
Product Attributes - Part Type
Fluid Coolers
Product Attributes - UPC
811580034084

Reference Information

Brand Name/s Mishimoto
StreetFX SKU misMMTC-DMAX-03SL
SFX Item ID 4048944
Supplier Item Code 4048944
Manufacturer SKU MMTC-DMAX-03SL
Manufacturer UPC 811580034084
Alternative References mio-mmtcdmax03sl, MIMMMTC-DMAX-03SL, 6.6L, (LB7/LLY)

Compatibility

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