Beefed Up Direct Fit Transmission Cooler Flow Bypass Valve And Gasket With Transmission Cooler Barbell Upgrade Kit For GM 6L80 6L90 8L80 8L90E 10L90 Transmissions 2014 And Up Bolt In Replacement With OEM Style Gasket
✔️ Direct bolt-in replacement with OEM gasket and stainless barbell
This direct, bolt-in upgrade replaces the factory thermostat internals in 2014+ GM 6L80/90 and 2016+ 8L80/90E transmissions (including the 10L90). It’s designed for use in trucks and SUVs like Silverado, Sierra, Tahoe, Cadillac, and other GM vehicles. CNC-machined 304 stainless steel with rubber seals delivers long-term durability and corrosion resistance. No cutting or modification required.
✅ Direct bolt-in replacement for OE part # STL010 with plug-and-play ease
✅ Includes bypass gasket (replacing OE 66219/15251488) and transmission cooler barbell
✅ Kit contains 3 large O-rings, 1 small O-ring, 1 small metal ball, 1 bushing, 1 piston, 1 coil spring
✅ CNC-machined 304 stainless steel body with rubber seals for durability
💡 What is a transmission cooler bypass valve kit used for in GM transmissions?
This handy upgrade helps control coolant flow and seal the system during service, improving reliability and simplifying maintenance.
- Improves coolant flow control in GM 6L80/90 and 8L80/90E families- Replaces internal thermostat parts with a direct-fit, plug-and-play design
- Uses 304 stainless steel and rubber seals for durability
- Quick install, typically about 20 minutes with basic tools
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