* Input shaft seal: This seal prevents fluid from leaking where the input shaft enters the transmission case. It's located on the driver's side, near the engine. This is a very common point of failure for transmission leaks.
* Output shaft seal: This seal is where the output shaft exits the transmission case. While often associated with the rear of the transmission, a significant leak *could* run down and appear to be coming from the driver's side, especially if the car's angle is causing the fluid to flow.
* Transmission case gasket: A failing gasket can cause leaks from various points on the transmission case itself. If the gasket is compromised on the driver's side, this would be a likely culprit.
* Speed sensor seal (if applicable): While less likely to cause a *major* leak, a leaking speed sensor seal could contribute. Check the condition of this seal, as it's located on the transmission's side.
Important Considerations:
* Fluid Type: Confirm the leaking fluid is indeed transmission fluid. It's reddish-brown and usually has a distinct smell. Other fluids might be confused for it, especially power steering fluid.
* Leak Location Precision: Try to pinpoint the *exact* location of the leak as accurately as possible. Take pictures and note any wetness trails. This will help narrow down the possibilities.
* Professional Diagnosis: Because there are several possible sources, it's advisable to have a mechanic inspect the transmission thoroughly to accurately diagnose the leak's origin and the best repair strategy. Ignoring a significant transmission leak will likely cause further damage.
Without a visual inspection, it's impossible to say definitively where the leak is coming from. The above list offers the most probable areas, however. Thorough examination is necessary for effective repair.
