Contact via call or WhatsApp only. I apologize for the delay in response. Condition: Brand new, unused Price: 280 SAR Location: Dammam Contact number: ( Phone number appears when clicking the contact button ) Advertisement details: Superior STL010 to bypass the transmission temperature valve for Sierra and Silverado models from 2014 to 2018, with a known and renowned bypass gasket among foreigners that reduces transmission temperature by 20-30%. You can watch clips on YouTube by searching for STL010. Superior 6L80 6L90 8L90 Sure Cool System Upgrade STL010 with Bypass Gasket The Superior STL010 is a Sure-Cool® cooler flow system that upgrades GM 6L80/90E and 8L90/90E transmissions, along with some Allison models. It provides full-time cooler flow, immediate cooler fill, and a built-in safety bypass to help lower average operating temperatures, prevent overheating, and extend the life of transmission fluid and components. The system also allows for a more accurate fluid level check without needing a warm-up cycle.