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

ALL IN ONE PREMIUM KIT - Includes cooler, hose, and hardware—everything you need to upgrade your transmission cooling system in one package.
HEAVY DUTY COMPATIBILITY - Supports Class 'A' motorhomes, large travel trailers, and 5th wheels with GVWR up to 30 lbs and towing up to 10 lbs.
PLUG PLAY INSTALLATION - Pre-drilled mounting brackets and included hardware make setup effortless—get back on the road faster.
PATENTED FLOW PATH DESIGN - Maximizes heat transfer while minimizing pressure drop—engineered for efficiency and reliability.
RAPID 11 INCH COOLING POWER - Compact plate and fin design delivers superior heat dissipation for peak transmission performance.

The Hayden Automotive 679 Rapid Cool Plate and Fin Transmission Cooler is a high-performance, 11-inch black cooler designed for heavy-duty vehicles like Class 'A' motorhomes and large trailers. Featuring patented internal turbulence technology, it optimizes heat transfer while minimizing pressure drop. The kit includes all necessary hardware and pre-drilled mounting brackets for quick, hassle-free installation, ensuring your transmission stays cool under demanding towing conditions.

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Manufacturer	Hayden Automotive
Part number	679
Item Weight	1.25 Kilograms
Product Dimensions	1.78 x 27.94 x 29.46 cm; 1.25 kg
Is Discontinued By Manufacturer	Yes
Size	11 Inch
Color	Black
Measurement System	Imperial
Mounting Type	Panel Mount
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	18 x 279 x 295 mm

Hayden Automotive 679 Rapid Cool Plate and Fin Transmission Cooler, Black, 11-Inch

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