Aluminium Transmission Cooling Kit with Bypass Valve for 6L80 6L90 8L90 10L90

Upgrade the cooling performance of your GM-spec transmission with the Aluminium Transmission Cooling Kit with Bypass Valve for 6L80, 6L90, 8L90, and 10L90. Built from high-quality aluminium and finished in a sleek silver, this kit is designed to fit 2014-and-later Cadillac, Chevrolet, and GMC vehicles, ensuring your transmission runs cooler, smoother, and more reliably under demanding conditions.

The standout feature is the built-in bypass valve, which enables immediate cooler fill and simplifies fluid level checks without a warm-up cycle. That means quicker, more accurate maintenance, reduced risk of overheating, and better ATF longevity even when you’re towing, climbing hills, or driving in hot climates. By lowering operating temperatures by up to 20%, this upgrade helps protect the transmission from heat-related wear and extends service life while maintaining optimal performance.

Designed for compatibility with the 6L80/6L90 family and the 8L90/10L90 series (including 8L80/90E in 2016 and newer models), this kit replaces OE part STL010 and is ready to install on 2014-up GM transmissions. It’s ideal for enthusiasts, fleet owners, or anyone looking to improve confidence on long trips or heavy-duty use.

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Benefits & Tips

• Use in hot climates or during heavy towing to keep transmission fluid temperatures within safe ranges and protect ATF life.
• Benefit from immediate fluid level checks after installation without needing a warm-up cycle.
• Schedule periodic inspections of the bypass valve and cooling lines to maintain optimal flow and cooling efficiency.

Product specifications

• Material: Aluminium
• Color: Silver
• Model Number: TP-1114-SOEM NO.: STL010
• Origin: Mainland China
• Application: 6L80/6L90/8L90/10L90 Transmission Cooling System Upgrade, 2014-Up; Fits Cadillac, Chevrolet, GMC Cars and trucks; 8L80/90E 2016-Up; 10L90; Replace OE STL010
• Compatibility: Fits 2014-Up GM transmissions including 6L80, 6L90, 8L90, and 10L90 (with 8L80/90E 2016+ support)
• Key features:
• Built-in safety bypass for immediate cooler fill
• Immediate, accurate fluid level check without warm-up cycle
• Reduces average operating temperatures by up to 20%
• Decreases risk of overheating under load and increases ATF life

Package includes:

• 1 x Cooling System Upgrade Kit

Warnings / Reminders

• Verify compatibility with your specific vehicle and transmission model before installation.
• Professional installation is recommended for 2014+ GM transmissions to ensure proper fit and sealing.
• After installation, confirm fluid levels using the bypass valve and follow standard maintenance intervals.