Is fit on 2007 gmc 2500 hd?

I believe so, buy the additional radiator fitting. Also don’t like mounting to the condenser coil, made my own brackets.

I have a '04 chevy trailblazer 4.2 i6 4wd with factory trans cooler. looking to upgrade to pull travel trailer. is there anything else i need?

I would leave the factory trans cooler in place and add the Hayden trans cooler in line if at all possible, especially if the factory cooler is a plate and fin cooler. It will give you that much more extra cooling.

Did you bypass stock trans cooler on 4runner?

I did it on a Nissan Rogue s , am using both now , but planning on by pass it when I hit the 100 k miles ‘cause usual failure of stock oil cooler and don’t want to get any water in tranny. Hope it helps .

Will the provided adapter fitting thread into my radiator on my 2003 gmc sierra 4.8?

It comes with a fitting, I’m not sure if it’s universal. I spliced mine into the existing hoses deleting the OEM cooler.

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❄️ Stay Cool, Tow Hard: The Ultimate Transmission Cooler Upgrade

COMPLETE COOLING KIT - Includes cooler, hose, and mounting hardware—everything you need to upgrade your transmission cooling game
EFFORTLESS INSTALLATION - Pre-drilled mounting brackets and 19mm hose barb fittings make setup a breeze—no sweat, no hassle
HEAVY DUTY COMPATIBILITY - Supports GVWR up to 30,000 lbs and towing up to 10,000 lbs—built for serious haulers
PRECISION COMPACT DESIGN - Sleek 11” x 3/4” profile fits seamlessly with OEM systems
NEXT LEVEL COOLING EFFICIENCY - Patented internal turbulation maximizes heat transfer while minimizing pressure drop—keep your transmission chill under pressure

The Hayden 679 Universal 11” Rapid-Cool Transmission Cooler is a premium add-on designed to enhance your vehicle’s cooling system. Featuring a compact plate and fin design with patented internal turbulation, it significantly improves heat transfer while minimizing pressure drop. Compatible with OEM cooler systems for Class A motorhomes and heavy trailers, it supports GVWR up to 30,000 lbs and towing capacities up to 10,000 lbs. The kit includes pre-drilled mounting brackets, hose barb fittings, and all necessary hardware for quick, secure installation.

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TrustScore 4.5 | 7,300+ reviews

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Connector Type	Hose Barb
Contact Material	Aluminum
Contact Type	Normally Open
Mounting Type	Bracket Mount
Brand	Hayden Automotive
Operation Mode	Automatic
UPC	036752006793
Manufacturer	Hayden Automotive
Model	Transmission Cooler
Item Weight	2.75 pounds
Product Dimensions	0.7 x 11 x 11.6 inches
Item model number	679
Is Discontinued By Manufacturer	Yes
Exterior	Machined
Manufacturer Part Number	679

Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)

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