2019-2023 Silverado/Sierra 1500 8L90 Cooler Bypass Delete (1061531)

The factory cooler bypass valve in the GM 8L90 8-speed automatic is a known weak point — debris can jam the internal valve in recirculation mode, starving the transmission cooler and causing fluid temps to climb. The BD Diesel Cooler Bypass Delete eliminates the bypass valve entirely, forcing 100% of transmission fluid through the external cooler at all times. A simple fix that removes a failure-prone component and keeps the 8L90 running at its lowest possible operating temperature.

Part Number: 1061531

• Eliminates the factory bypass valve — a common failure point in the GM 8L90 transmission
• Ensures 100% fluid flow through the transmission cooler at all times
• Keeps transmission operating temperature as low as possible
• Includes all new seals required for installation and a magnetic service plug

• Fits GM 8L90 transmissions with 1/2" cooler lines
• Replaces OEM Part Numbers: 85048209, 84443930, 84963102, 84969051

Don't see your question? Ask us anything about this product.