



🛠️ Upgrade your ride with GM’s trusted transmission cooler line—because your engine deserves the best.
The GM Genuine Parts 25999420 Automatic Transmission Fluid Cooler Inlet and Outlet Line is a factory-spec replacement part crafted from durable stainless steel. Engineered to meet GM’s original equipment standards, it ensures a perfect fit and reliable performance for GM automatic transmission systems. This ready-to-install component is designed to maintain optimal transmission fluid temperatures, enhancing vehicle longevity and efficiency.





| ASIN | B003YOD39E |
| Assembly Required | No |
| Brand | GM GENUINE PARTS |
| Colour | Silver |
| Country of Origin | USA |
| Customer Reviews | 4.5 4.5 out of 5 stars (191) |
| Date First Available | 7 August 2012 |
| Global Trade Identification Number | 00021625774961 |
| Item Dimensions LxWxH | 124.5 x 80 x 15.5 Centimeters |
| Item Weight | 871 g |
| Item model number | 25999420 |
| Manufacturer | ACDelco |
| Manufacturer Part Number | 25999420 |
| Material | Stainless Steel |
| Net Quantity | 1.0 Count |
| Nominal Wall Thickness | 0.03 inches |
| OEM Part Number | 25999420 |
| Product Dimensions | 124.46 x 80.01 x 15.49 cm; 870.9 g |
| Specific Uses For Product | Automatic transmission systems |
| UPC | 021625774961 |
| Volume | 9224 Cubic Inches |
J**S
Arrived quickly. Fit perfect. This was by no means easy to install, at no fault to the seller. I jacked up the passenger side, only because I needed to install a wheel speed sensor. Had to pull the front clip off, plastic only. I removed the electric radiator fans to facilitate installation, personal choice. There is a black plastic piece that runs and bolts in across the grill and bolts in under headlights, I removed the screw bolts in order to maneuver the line attaching to the AT cooler better. Removed some fender liner screw bolts and 2 brace screw bolts. All wheel drive front axle made it even more fun, I would have dropped the axle but my jack started leaking fluid. Anyway 6-8 hrs taking breaks and fighting rusted screw bolts. Probably could do it in 4 now that I've done it once.. GL
L**R
Bien hecho, de buena calidad, pero no le queda a mi Suburban 2010, ya que está manguera es para Suburban con radiador de aceite para Transmisión y mi Suburban no cuenta con el, y no le queda, pero si tú Suburban tiene Radiador de aceite de Transmisión seguro le queda.
D**.
Good fit.
M**R
Shipping was quick and other than challenges installing the lines, everything was perfect. Would definitely recommend this for anyone who has to replace the lines.
R**T
Works well I ordered it. Let it sit around for a year finally blew out changed. It works well no leaks, but in about a year.
Trustpilot
1 month ago
5 days ago