Transmission Oil Cooler - Hydra-Cool^® 30 Plate

Universal 3/8" Hose | Part Number: #679

The Davies Craig Hydra-Cool^® 30 Plate Transmission Oil Cooler is the ultimate heavy-duty transmission cooling solution, engineered for high-performance, towing and commercial applications. Featuring a uniquely patented dimple plate & fin design, the Hydra-Cool^® cooler delivers exceptional heat transfer while requiring up to 33% less mounting space than a comparable tube & fin cooler, making it ideal for modern engine bays where cooling performance and space efficiency are critical. High-efficiency internal turbulators redirect oil flow to maximise heat dissipation with minimal pressure drop for both road and race applications.

Designed for Heavy Duty 4WDs, V8-powered vehicles, commercial vehicles and motorsport applications, the Hydra-Cool^® 30 Plate Oil Cooler effectively reduces transmission temperatures to protect against overheating, premature wear and costly transmission repairs. Manufactured from lightweight aluminium and 100% pressure tested to 150 psi, every Hydra-Cool® Oil Cooler is built for maximum durability and long-term reliability.

Features

• Premium Hydra-Cool^® Dimple Plate & Fin design
• Up to 33% more efficient than comparable tube & fin coolers
• Heavy-duty cooling for demanding applications
• Patented dimple plates redirect oil flow for superior heat transfer
• High-efficiency internal turbulators minimise pressure drop
• Reduces automatic transmission fluid temperatures
• Protects against heat-related transmission wear and failure
• Lightweight all-aluminium construction
• 100% pressure tested to 150 psi
• Pre-drilled mounting plates for simple installation
• 3/8" (9.5 mm) push-on fittings
• Designed and engineered by Davies Craig

Applications

Recommended for:

• Heavy Duty 4WDs
• V8-powered vehicles
• Commercial vehicles
• Performance and modified vehicles
• Heavy towing applications
• Caravan and trailer towing
• Motorsport and racing applications
• Fleet vehicles
• Severe duty operating conditions

Kit Contents

• 1 × Hydra-Cool® 30 Plate Transmission Oil Cooler
• 1 × 1.4m (3/8") Transmission Hose
• 4 × Hose Clamps
• 2 × Quick Fit Kits (4 Nylon Mounting Ties per Kit)
• Installation Instructions

Specifications

Why Install a Hydra-Cool® Transmission Oil Cooler?

Heat is the leading cause of automatic transmission wear and failure. Heavy towing, off-road driving, steep climbs, commercial use and high-performance applications generate excessive transmission temperatures that accelerate fluid breakdown and reduce transmission life.

The Davies Craig Hydra-Cool® 30 Plate Transmission Oil Cooler removes excess heat before the fluid returns to the transmission, helping maintain optimum operating temperatures, improve shift quality and significantly extend transmission and transmission fluid life. Its patented dimple plate & fin construction provides maximum cooling efficiency in a compact, heavy-duty package, making it the ideal choice for vehicles operating under the harshest conditions.

How to Select the Correct Transmission Oil Cooler

All Davies Craig transmission oil coolers are universal fit, making it easy to choose the right cooler based on the available mounting space rather than your vehicle's make or model.

Step 1 – Determine the Correct Cooler for Your Application

Use the Transmission & Engine Oil Cooler Product Selection Guide (below) to identify the recommended transmission oil cooler for your application. The guide considers factors such as:

• Vehicle type
• Transmission type
• Intended use and operating conditions

This will recommend the appropriate transmission oil cooler size for your application.

Step 2 – Is a Thermatic^® Fan Beneficial?

Some applications benefit from the addition of a Thermatic^® Electric Fan to provide consistent airflow through the oil cooler when natural airflow is limited.

A fan is recommended for applications including:

• Towing
• Motorsport or performance driving
• Off-road vehicles
• Remote-mounted oil coolers
• Low-speed or stop-start operation

The Transmission & Engine Oil Cooler Product Selection Guide will indicate when a Thermatic® Fan is recommended for your application.

Step 3 – Measure the Available Space

Most transmission oil coolers are mounted in front of the radiator or air conditioning condenser to maximise airflow.

Measure the available installation area and record the following dimensions:

• Width
• Height
• Available Clearance (Depth)

Step 4 – Choose the Largest Cooler That Fits

As a general rule, the largest transmission oil cooler that comfortably fits within the available space will provide the best cooling performance. A larger cooler offers greater heat dissipation, helping to maintain lower automatic transmission fluid (ATF) temperatures, particularly when towing, carrying heavy loads, driving off-road, or operating in hot conditions.

Step 5 – Compare Your Measurements

Once you have your dimensions, visit the Davies Craig Transmission Oil Coolers page and review the Specifications & Range table located approximately halfway down the page.

There you can:

• Compare each oil cooler's dimensions with your available mounting space.
• Select the largest cooler that can be installed without interfering with surrounding components.
• Choose from our Ultra-Cool^® Tube & Fin or Hydra-Cool^® Plate & Fin ranges to suit your application.

Need Assistance?

If you're unsure which transmission oil cooler is best suited to your vehicle, our technical team is here to help.

Simply take your measurements and contact Davies Craig—we'll be happy to recommend the most suitable oil cooler for your application.

SPECIFICATION & RANGE Transmission & Engine Oil Coolers
Part #	Image	Plates	Thickness  mm	Overall		Core		Inlet/Outlet Size	Hose Size	Heat Transfer Rate (BTU/HR)	Fluid Capacity
				Width mm	Height mm	Width mm	Height mm
Power Steering Cooler &  Ultra-Cool Transmission Oil Cooler (Tube & Fin)
1009		Tube & Fin	19	237	64	148	64	3/8” 9.5mm	3/8” (9.5mm) 1.2m	4,000	43ml
401			20	326	128	245	128			9,000	122ml
403			20	326	191	246	191			10,800	207ml
404			20	395	191	316	191			12,000	248ml
Hydra-Cool Transmission Oil Cooler (Plate & Fin)
676		12	20	281	141	281	112	3/8” 9.5mm	3/8” (9.5mm) 1.4m	11,987	81ml
677		17	20	281	180	281	152			13,394	115ml
678		23	20	281	229	281	200			13,937	158ml
679		30	20	281	300	281	265			15,710	201ml
Transmission Oil Cooler & Fan Combo Kits
698 (12V)		23	76	281	229	281	200	3/8” 9.5mm	3/8” (9.5mm) 1.4m	13,937	158ml
699 (24V)
691 (12V)		30	76	281	300	281	265			15,710	201ml
692 (24V)
Universal Engine/Transmission Oil Cooler
602		14	32	258	224.5	258	185.5	AN10 ORB	N/A	21,000	500ml
605		19	50	330	166	285	142			37,000	440ml
610		30	50	330	249	285	226			50,000	690ml
616		14	32	258	224.5	258	185.5	M16	N/A	21,000	500ml
Universal Engine/Transmission Oil Cooler & Fan Combo Kits
600 (12V)		14	87	258	224.5	258	185.5	AN10 ORB	N/A	21,000	500ml
608 (12V)		30	106	330	249	285	226			50,000	690ml
614 (12V)		14	87	258	224.5	258	185.5	M16	N/A	21,000	500ml
Accessories
1005		5/16" (8mm) Adaptor Kit - Transmission Oil Cooler to suit GM transmissions
1006		Transmission Oil Cooler Fitting Kit (6R80) Suits Ford Ranger and Mazda BT50
1007		Transmission Temperature Sensor Adapter Kit - suits 3/8” Hose and 1/4” NPT Sensor
1008		AN10 ORB to 3/8" Push on Hose Barb Fitting
1010		Transmission Oil Cooler Fitting Kit (AN10 ORB to 3/8" Hose)
579		Quick Fit Kits (Mounting Kit)
0444 0445 0500		Digital Thermatic® / Electric Fan Switches

Please visit our buy online section to view the Davies Craig TRANMISSION OIL COOLER range.