PPE 124064000 Bar & Plate Transmission Cooler for 2015-2016 LML Duramax (Allison 1000)

Excessive heat is the #1 killer of Allison 1000 transmissions. The factory tube-and-fin cooler simply can’t keep up once you start towing, hauling, or running performance modifications that increase mainline pressure. The PPE 124064000 Bar & Plate Transmission Cooler is a direct-fit, heavy-duty upgrade designed specifically for the 2015-2016 GM 6.6L Duramax LML with the Allison 1000 transmission.

Why Upgrade to PPE’s Bar & Plate Design?

PPE’s bar and plate construction is far superior to the OEM stacked-plate or tube-and-fin coolers. Inside the core, staggered square-pattern bars slow the hot fluid while dramatically increasing the heat-transfer surface area. Outside, dense louvered aluminum fins maximize airflow and heat dissipation to ambient air. The result is a massive increase in cooling capacity in a bolt-on package.

Key Performance Highlights:

• 211 cubic-inch core — approximately 105% larger than stock for superior heat rejection
• 20% larger frontal area — exposes more surface to airflow
• Observed transmission fluid temperature drops of 30–40°F (real-world results vary with conditions and use)
• All-aluminum construction with fully TIG-welded end tanks for strength and durability
• Retains all factory mounting points for a true bolt-on installation
• Includes new quick-connect fittings that work with your stock transmission lines (7/8-14)

Perfect For:

• Daily drivers that tow or haul regularly
• Trucks with performance transmissions or increased line pressure
• Hot climates or heavy-use applications where stock cooling is marginal
• Anyone who wants to extend the life of their Allison 1000

Easy Installation

This is a true direct replacement. No cutting, no custom lines, and no fabrication required. The kit includes everything needed for a clean, factory-looking install that retains all original mounting locations.

Built to Last

PPE backs this cooler with a limited lifetime warranty. It’s engineered as a heavy-duty performance part that pays for itself through longer transmission life and fewer heat-related issues.

Fitment: 2015–2016 Chevrolet Silverado 2500HD / 3500HD & GMC Sierra 2500HD / 3500HD 6.6L Duramax LML with Allison 1000 transmission only.

The PPE Bar & Plate Transmission Cooler is one of the smartest, most effective upgrades you can make to your LML Duramax.