The SunCoast 37711-12L Allison Shallow Filter Kit is a complete transmission service solution for GM Duramax trucks equipped with an Allison 1000 transmission and shallow transmission pan. This kit includes the internal shallow pan filter, external spin-on filter, and the proven SunCoast Filter Lock to help keep the internal filter securely in place under high-pressure conditions.

Designed for towing, daily driving, racing, and high-performance applications, this kit helps maintain proper transmission filtration while reducing the risk of filter blowout and fluid starvation that can lead to costly transmission damage.

Features

• Complete Allison shallow pan transmission filter service kit
• Includes internal shallow pan filter
• Includes external spin-on transmission filter
• Includes SunCoast Allison Filter Lock
• Helps prevent internal filter blowout under high pressure
• Designed for Allison shallow transmission pans
• Ideal for towing, racing, and heavy-duty applications
• Direct-fit replacement components

What’s Included

• Allison shallow internal transmission filter
• Spin-on external transmission filter
• SunCoast filter lock retention bracket

Vehicle Fitment

• 2001-2019 Chevrolet Silverado 2500HD/3500HD
• 2001-2019 GMC Sierra 2500HD/3500HD
• 6.6L Duramax equipped with Allison 1000 transmission
• For use with factory-style shallow transmission pans

Why Use a Filter Lock?

Under heavy load and elevated transmission pressure, the factory Allison internal filter can become unseated from the pump inlet. If the transmission loses fluid pickup, it can quickly result in slipping, overheating, or severe transmission failure. The included SunCoast Filter Lock helps keep the filter securely retained during demanding conditions.

Built for Duramax Performance

SunCoast transmission products are trusted throughout the diesel industry for their reliability and performance in both street and competition applications. This complete filter service kit provides the filtration and protection needed to help extend the life of your Allison transmission.

Note: Designed specifically for Allison transmissions using a shallow transmission pan. Not compatible with deep pan filter setups.

Part Number: 37711-12L