# Mishimoto 01-03 Chevrolet / GMC 6.6L Duramax (LB7) Transmission Cooler

There's no greater enemy for a transmission than heat. Whether your 2001-2003 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 2001-2003 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 2001-2003 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.

-   CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
-   Stacked-plate construction for maximum durability and superior cooling
-   Direct-fit for all 2001-2003 Chevrolet/GMC with Allison transmission

This Part Fits:

Year

Make

Model

Submodel

2001-2003

Chevrolet

Silverado 2500 HD

Base

2001-2003

Chevrolet

Silverado 2500 HD

LS

2001-2003

Chevrolet

Silverado 2500 HD

LT

2001-2003

Chevrolet

Silverado 3500

Base

2001-2003

Chevrolet

Silverado 3500

LS

2001-2003

Chevrolet

Silverado 3500

LT

2002-2003

GMC

Sierra 2500 HD

Base

2001-2002

GMC

Sierra 2500 HD

SL

2001-2003

GMC

Sierra 2500 HD

SLE

2001-2003

GMC

Sierra 2500 HD

SLT

2003

GMC

Sierra 2500 HD

WT

2002-2003

GMC

Sierra 3500

Base

2001-2002

GMC

Sierra 3500

SL

2001-2003

GMC

Sierra 3500

SLE

2001-2003

GMC

Sierra 3500

SLT

## Details

- **Price:** 710.56 CAD
- **Vendor:** Mishimoto
- **Type:** Transmission Coolers

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 710.56 CAD | In stock |

## Images

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/mishimoto-01-03-chevrolet-gmc-6-6l-duramax-lb7-transmission-cooler)
> Updated: 2026-06-27