The SunCoast A1-FLT-LOC Allison Shallow Filter Lock is designed to keep the factory Allison transmission filter securely in place under high-pressure and heavy-load conditions. On high-performance, towing, and competition trucks, the factory shallow filter can become dislodged, causing fluid starvation and potentially severe transmission damage. This filter lock provides a simple and effective solution to help protect your Allison transmission.

Designed for Duramax trucks equipped with the Allison 1000 transmission and a shallow transmission pan, the SunCoast Filter Lock is an inexpensive upgrade that adds extra insurance for demanding applications.

Features

• Prevents shallow Allison transmission filter from becoming dislodged
• Helps maintain proper fluid pickup under extreme conditions
• Reduces risk of cavitation and transmission failure
• Designed for Allison shallow pan filter setups
• Simple installation
• Ideal for towing, racing, sled pulling, and performance builds
• Durable construction for long-term reliability

Vehicle Fitment

• 2001-2019 Chevrolet Silverado 2500HD/3500HD
• 2001-2019 GMC Sierra 2500HD/3500HD
• 6.6L Duramax with Allison transmission
• For use with Allison shallow transmission pan/filter setups

Why Install a Filter Lock?

Under heavy throttle, towing loads, or elevated line pressure, the factory Allison filter can unseat from the pump inlet. If this occurs, the transmission may lose fluid pickup, resulting in slipping, overheating, or catastrophic transmission damage. The SunCoast Shallow Filter Lock helps eliminate this problem by positively retaining the filter.

Built for Demanding Duramax Applications

Whether your truck is used for daily driving, towing, racing, or sled pulling, protecting your Allison transmission is critical. SunCoast transmission components are trusted throughout the diesel industry for proven durability and performance.

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

Part Number: A1-FLT-LOC