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.
Recommended for:
| Specification | Details |
|---|---|
| Part Number | 679 |
| Cooler Type | Hydra-Cool® Dimple Plate & Fin |
| Number of Plates | 30 |
| Construction | Aluminium |
| Overall Dimensions | 281 × 300 × 20 mm |
| Core Dimensions | 281 × 265 mm |
| Hose Size | 3/8" (9.5 mm) |
| Heat Transfer Capacity | 15,710 BTU/hr |
| Fluid Capacity | 100 ml |
| Pressure Tested | 150 psi |
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.
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SPECIFICATION & RANGE Transmission & Engine Oil Coolers |
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| Part # | Image | Plates | Thickness mm |
Overall | Core | Inlet/Outlet Size |
Hose Size | Heat Transfer Rate (BTU/HR) |
Fluid Capacity |
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| Width mm | Height mm | Width mm | Height mm | ||||||||
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Power Steering Cooler & Ultra-Cool Transmission Oil Cooler (Tube & Fin) |
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| 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 | |||||||||
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PRODUCT SELECTION GUIDE Transmission & Engine Oil Coolers |
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|---|---|---|---|---|
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Vehicle Type |
APPLICATION |
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| Standard Duty / No Towing | Medium Duty/Light Towing | Heavy Duty/Heavy Towing | Super heavy Duty Transmission cooler or Engine oil cooler | |
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Part Number |
Part Number |
Part Number |
Part Number |
|
| 4 Cyl. Up to 1990* |
#401 or #676 |
#403 or #676 |
#404 or #677 |
#602 |
| 6 Cyl. Up to 1990* |
#403 or #676 |
#404 or #677 |
#678 or #679 |
#602 |
| 8 Cyl. Up to 1990* |
#404 or #677 |
#678 | #679 |
#602 or #605 |
| Small Car | #676 | #677 | #678 |
#602 or #605 |
| Sedan / Wagon | #677 | #678 | #679 |
#602 or #605 or #610 |
| 4WDs & SUV | #678 | #679 | #602 |
#605 or #610 |
| Commercial | #678 | #679 |
#602 or #605 |
#610 |
| Cooler and Fan combo recommended for low-speed driving/towing and off-road applications | ||||
| Small Car |
#698 (12V) #699 (24V) |
#698 (12V) #699 (24V) |
#698 (12V) #699 (24V) |
#600 (12V) or #614 (12V) or #608 (12V) |
| Sedan / Wagon |
#698 (12V) #699 (24V) |
#698 (12V) #699 (24V) |
#691 (12V) #692 (24V) |
#600 (12V) or #614 (12V) or #608 (12V) |
| 4WDs & SUV |
#698 (12V) #699 (24V) |
#691 (12V) #692 (24V) |
#600 (12V) #692 (24V) |
#600 (12V) or #614 (12V) or #608 (12V) |
| Commercial |
#698 (12V) #699 (24V) |
#691 (12V) #692 (24V) |
#600 (12V) #692 (24V) |
#608 (12V) |
| Oil Cooler Accessories recommended for specific Transmissions | ||||
| GM-Holden Transmission | Select cooler as above plus #1005 | Select cooler as above plus #1005 | Select cooler as above plus #1005 | Select cooler as above plus #1005 |
| 6R80 Transmission | Select cooler as above plus #1006 | Select cooler as above plus #1006 | Select cooler as above plus #1006 | Select Part # as above plus #1006 |
| Power Steering Oil Cooler | ||||
| Vehicle | Standard Duty | Medium Duty | Heavy Duty | Super heavy Duty |
| All Vehicles | #1009 | #401 | #403 | #404 |
