* Transmission Fluid Leak (Internal): The most probable cause of needing constant transmission fluid without an external leak is an internal leak within the transmission itself. Fluid could be leaking into:
* The engine: This is the most likely explanation given the white smoke. Transmission fluid leaking into the engine's cylinders will burn off, producing the white smoke you're seeing. White smoke usually indicates burning coolant or transmission fluid (both are water-based). This is a serious problem and will cause significant engine damage if not addressed immediately.
* The bell housing: Fluid could be leaking into the bell housing, the area between the engine and transmission. This will likely contaminate the clutch.
* Other possibilities: While less likely given the white smoke, a very slow leak could be occurring somewhere that’s difficult to spot, or it could be evaporating before it pools. However, this is less likely given the constant need to refill.
The White Smoke: The white smoke is a crucial clue. Burning transmission fluid in the engine will severely damage your engine's internals. This needs immediate attention. Continuing to drive it will likely lead to a catastrophic engine failure.
What you should do:
1. Stop driving the truck immediately. Driving it while the transmission fluid is leaking into the engine will cause significant and likely irreparable damage.
2. Have it towed to a reputable mechanic. Don't attempt any repairs yourself. Diagnosing and fixing this requires specialized knowledge and tools.
3. Explain the symptoms clearly to the mechanic. Mention both the constant transmission fluid loss and the white smoke. The mechanic will likely need to inspect the transmission, engine, and potentially perform a compression test to pinpoint the exact location of the leak and the extent of the damage.
This is a serious issue that requires professional attention. Ignoring it will likely result in costly repairs or even a totaled vehicle. Get it to a mechanic as soon as possible.
