What you might need to do depends on the *specific* problem:
* Leaking transmission line: This requires locating the leak precisely. Often, a small leak can be repaired with a specialized sealant, but larger leaks or damage usually mean replacing a section of line or the entire line assembly. This involves disconnecting lines, draining transmission fluid, and potentially working under the car.
* Damaged transmission line: Similar to a leak, damage could be from rust, a collision, or other external factors. Replacement may be necessary.
* Complete transmission line replacement: This is a major undertaking, likely requiring professional help. It involves removing old lines, carefully routing new ones, and ensuring proper connections. There are high-pressure lines involved, and improper work can lead to serious problems, including fluid loss and transmission damage.
Instead of attempting this yourself, here's what you should do:
1. Identify the problem precisely: Is it a leak? Is the line kinked or damaged? Take photos.
2. Take your car to a qualified mechanic: Explain the problem. They have the tools, experience, and know-how to diagnose and repair the issue correctly. A professional will be able to assess the damage and determine the most cost-effective solution (repair vs. replacement). They'll also handle the proper disposal of used transmission fluid.
Trying to fix transmission lines yourself without the proper experience and tools is risky. You could cause further damage to your transmission, leading to expensive repairs or even requiring a transmission replacement. Professional help is almost always the best choice in this situation.
