125071000 8L90 Trans Fluid Therm Bypass For Chevy GMC 1500 2015-2018

8L90 Trans Fluid Therm Bypass for Chevy and GMC

This 8L90 trans fluid therm bypass routes transmission oil directly to the cooler to maintain lower operating temperatures, referencing part number 125071000.

Overview

This replacement 8L90 trans fluid therm bypass replaces the restrictive factory thermal valve to allow immediate transmission fluid cooling flow. Designed to prevent transmission overheating under load, this 8L90 trans fluid therm bypass bypasses the factory thermostat to keep fluid moving through the external cooler. This 8L90 trans fluid therm bypass is designed for truck owners who tow heavy loads or drive in hot climates.

Built For Performance

• Bypasses the restrictive factory thermostat for immediate fluid routing.
• Constructed from billet aluminum for long-term durability.
• Helps lower transmission operating temperatures to extend fluid life.
• Direct bolt-on design matches original mounting flanges.

Fits These Machines

• for Chevy Silverado 1500 (2015-2018)
• for GMC Sierra 1500 (2015-2018)

On-The-Job Use

• Installed on light-duty trucks to prevent automatic transmission overheating.
• Used to replace failing or stuck closed OEM thermal bypass valves.
• Highly beneficial during heavy-duty towing or payload hauling.

Specs At A Glance

Good To Know

Q: Will this bypass cause my transmission to run too cold in the winter? A: While it allows constant flow, modern transmissions still heat up to safe operating levels, though warmup may take slightly longer in extreme cold.

Q: Is this bypass difficult to install? A: No, it is a straightforward external bolt-on part located on the transmission casing, taking minimal time with basic hand tools.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.