Mishimoto Transmission Cooler 99-13 Chevrolet Silverado / GMC Sierra | 521% Larger Core | Performance Transmission Cooler
Overview
The Mishimoto Transmission Cooler for 1999-2013 Chevrolet Silverado and GMC Sierra trucks is engineered to combat one of the most critical threats to transmission longevity: excessive heat. Whether your GMT800 or GMT900 platform truck serves as a heavy-duty tow vehicle, a hardworking fleet truck, or a daily driver, maintaining optimal transmission temperatures is essential to prevent premature wear and costly repairs. This cooler is designed specifically to enhance cooling capacity and ensure reliable transmission performance under demanding conditions.
Built around a robust stacked-plate core design, this Mishimoto cooler stands out with its massive size—521% larger than the factory unit—and a 278% increase in frontal area. The internal and external louvered fins optimize airflow and fluid circulation, maximizing heat dissipation. Precision-machined -6ORB quick-disconnect fittings allow for seamless integration with stock transmission lines or the option to upgrade to -6AN lines, while the included relocation bracket preserves the ambient air temperature sensor’s functionality. This thoughtful engineering reflects Mishimoto’s commitment to durable, high-performance cooling solutions.
For Silverado and Sierra owners, this transmission cooler translates to tangible benefits: improved transmission temperature control during towing, off-road, or stop-and-go driving, which extends transmission life and enhances drivetrain reliability. The adjustable mounting bracket simplifies installation, making it accessible for enthusiasts who want to upgrade their truck’s cooling system without extensive modifications. Backed by Mishimoto’s Lifetime Warranty with Accident Protection, this cooler offers peace of mind alongside proven performance.
Features & Specifications
This Mishimoto transmission cooler is engineered for 1999-2013 Chevrolet Silverado and GMC Sierra trucks and features a stacked-plate core design that is 521% larger than stock. Constructed from durable aluminum, it delivers superior heat dissipation for truck owners seeking reliable transmission cooling under heavy load and demanding conditions.
-
Brand: Mishimoto
-
Product: Transmission Cooler 99-13 Chevrolet Silverado / GMC Sierra
-
Part Number: MMTC-GMT-99
-
Fitment: 1999-2013 Chevrolet Silverado / GMC Sierra
-
Material: Aluminum
-
Finish: Black powder coat
-
Construction: Stacked-plate core with louvered fins
-
Origin: Made in China
-
Core Size Increase: 521% larger than stock
-
Frontal Area Increase: 278% larger than stock
-
Fittings: -6ORB quick-disconnects, compatible with -6AN lines
-
Included Accessories: Ambient air temperature sensor relocation bracket, adjustable mounting bracket
Key Benefits
-
Performance: Significantly reduces transmission temperatures under heavy towing and low-speed conditions to prevent overheating.
-
Durability: Robust stacked-plate aluminum core resists corrosion and damage for long-lasting reliability.
-
Fitment: Designed specifically for 1999-2013 Silverado and Sierra trucks ensuring direct compatibility and easy installation.
-
Ease of Installation: Adjustable mounting bracket and quick-disconnect fittings simplify the upgrade process.
-
Functionality: Retains full ambient air temperature sensor operation with included relocation bracket.
-
Warranty: Lifetime Warranty with Accident Protection provides confidence in product longevity.
What's Included
- 1× Mishimoto Transmission Cooler for 99-13 Chevrolet Silverado / GMC Sierra
- 2× -6ORB quick-disconnect fittings
- 1× Ambient air temperature sensor relocation bracket
- 1× Adjustable mounting bracket
- Installation instructions
Installation & Compatibility
Installation of the Mishimoto transmission cooler is straightforward and can typically be completed within an hour using basic hand tools. The adjustable mounting bracket allows for flexible placement in the engine bay, and the quick-disconnect fittings enable easy connection to stock transmission lines or optional -6AN lines for custom setups. No major modifications are required, making this a DIY-friendly upgrade for most Silverado and Sierra owners. Maintaining the ambient air temperature sensor’s function is ensured by the included relocation bracket. This cooler is compatible with all 1999-2013 GMT800 and GMT900 Chevrolet Silverado and GMC Sierra models, but verifying fitment for your specific year and trim is recommended.
-
Professional Installation: Recommended for those unfamiliar with transmission line work
-
Modifications Required: None
-
Verify Compatibility: Confirm fitment for your specific year and trim level
Shop with confidence at Subimods—your Subaru parts specialists.
