

⚙️ Upgrade your ride’s cooling game—no hacks, just precision!
The Hayden Automotive 390 Transmission Line Fitting Kit enables quick and clean auxiliary transmission cooler installation without cutting original equipment lines. Made from durable machined metal and precisely sized at 12.95 cm length, it ensures a professional fit and reliable performance for vehicle maintenance enthusiasts.


| Brand | Hayden Automotive |
| Material | Metal |
| Color | Machined |
| Product Dimensions | 12.96"L x 4.32"W |
| Inside Diameter | 0.63 Inches |
| Outside Diameter | 4.32 Centimeters |
| Item Length | 12.95 Centimeters |
| UPC | 036752003907 |
| Manufacturer | Hayden Automotive |
| Global Trade Identification Number | 00036752003907 |
| Model | Hayden 390 |
| Item Weight | 1.6 ounces |
| Item model number | 390 |
| Exterior | Machined |
| Manufacturer Part Number | 390 |
M**W
It worked
Worked perfect for 2014 express 3500
L**T
Arrived on time.
Works great on my 97 C5 Radiator trans coolant connector.
G**S
Didn’t match OEM
They weren’t the correct item and didn’t match my vehicle, but they were too expensive to return, so I just kept them
A**K
Great product, but you don't need both in most applications.
A perfect fit when I added a trans cooler to my 02 Silverado...the only downfall is that they sell you two when you only need the male fitting.
A**R
ford escort fitting
did not fit my 1998 ford escort.it said it would but didnt
R**.
This fits 2001 Buick Lesabre with 3.8
This fits perfect on the 2001 Buick Lesabre, it was worth the wait. I'm using this to simplify hook up for my add on transmission cooler. It fit great, factory fittings still used, and unharmed. I thought I would share to verify this fits vehicle listed here.
M**.
Perfect for C5 Corvettes
Work perfect on my Corvette C5
G**.
Perfect for 2002 silverado
Used these to install a tranny cooler on my 2002 Silverado 2wd with a 4.8L V8 NON tow package. This made the installation very simple. The tranny line on the passenger side of the radiator at the top is the one you want to use. Remove the retaining clip and pull that line out, grab a wrench and twist off the bolt/connector that is still in the radiator. Screw in part one, then put the part with the retaining clip and the piece you removed from the radiator and put them all together on the line itself. Now you should have 2 barbed inlets to match up to your cooler.
Trustpilot
2 weeks ago
3 days ago