If the transmission fluid needs to be changed, it will smell burnt. This will often look a lot like transmission fluid. My transmission is leaking fluid after a repair Q. I recently had some transmission work done by a professional, drove the car home, parked it in my garage, and haven’t used it since. This only happens when the tractor is running. It usually smells similar to petroleum. If the leak is accumulating near the rear end of your vehicle, then there's a good chance it's differential fluid. I have not been able to find which fluid is getting low yet. If you have a rear, 4 wheel or all-wheel drive vehicle, the leak point is often right in the middle of your vehicle making it something you probably won’t notice unless you’re regularly crawling under your … Transmission fluid is a slick liquid that's oily to the touch, much like engine oil or brake fluid. Many of these issues can occur following an oil change even if it was done by a mechanic. While both engine oil leaks and transmission fluid leak can make a puddle under the vehicle, it is easy to distinguish the two. If you have an adequate amount of transmission fluid in your transmission, then it will be able to cool these internal parts and even assist in delivering power to the transmission from the engine. Transmission fluid is sometimes difficult to distinguish from oil; however, this fluid has more of a reddish color and smells similar to gasoline. This oil pump seal can be difficult because the engine and the transmission must be seperated. I have oil streaming out of the center hole (Cotter Key) of the access panel in the bottom of the tractor right between the engine and transmission. The seals prevent fluid from leaking out between the transmission (also known as a transaxle) and the constant velocity (CV) axles. In terms of dealing with the transmission, I'd suggest draining the fluid in case you inadvertently separate the torque converter from the fluid pump, because of you do, you'll lose a bunch of fluid on the floor (see the notes from the 2nd thread Witek linked). If you determine that your leak is transmission fluid, take your vehicle to a mechanic as soon as possible. Rear main seal leaks are common, so if the color of the fluid is brown, it’s most likely oil leaking from the rear main seal. Leaking Transmission fluid can often be more difficult to identify than other types of leaks. A fluid leak is not only associated with transmission fluid, but it can also be an engine oil leak. Automatic transimission pump seals leaks can be seen between the engine and the transmission. Vehicles with a front-wheel drive bias layout usually have two output shaft seals (also known as axle seals). Here are some signs that it’s time to flush your transmission: Dark red or brown fluid on your transmission dipstick - Fresh ATF is brilliant red. However, you can usually tell them apart based on the location of the leak. Leaks from other fluids may cause a burning smell if they leak into or onto the engine… The only difference is the transmission will use transmission fluid as its lubricant instead of oil. I changed all the fluids and brought them up to level. This is one that people can commonly recognize. Leaking Transmission Fluid Causes Transmission fluid leaks will appear closer to the center of the vehicle. Identify where the leaking fluid is dripping from. The seal prevents fluid from leaking out between the transmission and the driveshaft. If the fluid on your dipstick is dark, it means that foreign particles have accumulated in your ATF. Transmission slipping - Poor coordination between the engine and your vehicle. Differential Fluid. 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