Granatelli 431000B Billet Thermostat Housing for 2018-2021 Jeep Grand Cherokee

Vehicle Fitment

• 2018-2021 Jeep Grand Cherokee (Trackhawk, 6.2L Supercharged V8)
• 2021-2025 Dodge Durango (Hellcat, 6.2L Supercharged V8)

Features

• Billet aluminum thermostat housing built from 6061-T6 for strength and longevity
• Flush-mount bolt design that improves coolant flow vs. OEM casting restrictions
• Approximately 40% increase in coolant flow compared to stock housing
• Includes ½" NPT threaded port for optional temperature or pressure sensor
• No gasket required - seals using O-ring or built-in sealing surface for leak-free install
• Direct OEM bolt-on fit - uses factory mounting points for a clean, OE-style install
• No modification required; installable with basic hand tools
• Anodized black finish for corrosion resistance and clean under-hood appearance

Specifications

• Part Number: 431000B
• Material: 6061-T6 billet aluminum
• Finish: Black anodized
• Fitment Water Neck Inlet: Stock OEM size
• Threaded Port: ½" NPT for sensor or pipe plug
• Thermostat Included: No - housing only
• Mounting Hardware: Included (uses factory bolts)
• Flow Improvement: ~40% increase over stock casting (per manufacturer)

Included Components

• 1x Billet Thermostat Housing (431000B)
• Mounting hardware (bolts) as required for OE-style install

Product Description

The Granatelli 431000B Billet Thermostat Housing is a premium cooling component engineered for high-output supercharged 6.2 L V8 engines in the Jeep Grand Cherokee Trackhawk (2018-2021) and Dodge Durango Hellcat (2021-2025). By replacing the restrictive OEM cast housing with this 6061-T6 billet aluminum unit, coolant flow is significantly improved - up to 40% more than stock. This helps maintain optimal engine temperature under heavy load or track use, reducing thermal stress on the thermostat and improving overall cooling reliability.

Installation is straightforward: the housing uses factory bolt-on points and stock water neck dimensions, so no modifications are needed. A built-in ½" threaded port allows the addition of a temperature or pressure sensor for monitoring coolant condition. This housing is ideal for performance-driven owners running supercharged engines, towing, or frequent heavy use - offering enhanced durability, better coolant flow, and improved under-hood reliability compared to the stock thermostat housing.