* Internal Transmission Failure: This is the most probable cause. Several things inside the transmission could be preventing power transfer to the wheels:
* Broken or worn clutch packs: These are responsible for engaging the gears. Wear and tear, or sudden failure, can prevent them from grabbing.
* Failed planetary gears: These are essential components for gear ratios. Damage here will prevent power from getting to the wheels.
* Low or no transmission fluid pressure: Even with the correct fluid level, internal leaks or a pump failure can drastically reduce pressure, rendering the transmission inoperative. A low level could have also caused internal damage already.
* Solenoid or valve body problems: These electrical components control fluid flow within the transmission. A malfunctioning solenoid or valve body can prevent the proper engagement of gears.
* Torque Converter Issues: Though less likely at low mileage, a faulty torque converter could prevent power from transferring from the engine to the transmission.
Why it seems sudden: Transmission failures often don't show obvious warning signs until the final moment. Internal wear can accumulate gradually until a component finally fails, resulting in a sudden inability to move.
What to do:
1. Don't try to force it: Continuing to rev the engine will only cause more damage.
2. Professional Diagnosis: Have a transmission specialist (not just a general mechanic) diagnose the problem. They'll need to inspect the transmission, likely including checking fluid pressure and potentially performing a more thorough inspection by removing the transmission pan or even disassembling part of the transmission.
3. Consider the age: While low mileage, the age of the vehicle (20 years) can still lead to component failure. Rubber seals and other components degrade over time regardless of use.
In short, given the symptoms, a major internal transmission problem is almost certain. Get a professional opinion to determine the exact cause and the best course of action (repair or replacement). At 60,000 miles, a rebuild *might* be cost-effective, but a replacement transmission could also be a viable option depending on the severity and cost of the repair.
