However, a locking transmission when stopping *could* be caused by several things, including a faulty torque converter, but also many others:
Possible Causes (requiring professional diagnosis):
* Torque Converter: A malfunctioning torque converter can indeed cause this symptom. It might be stuck or failing to unlock properly. This often manifests as a shuddering or locking sensation during low speeds or stops.
* Transmission Valves/Solenoids: Internal problems within the transmission's valve body, including sticking or faulty solenoids, can prevent the transmission from shifting properly, leading to a locked-up feeling.
* Low Transmission Fluid: Lack of sufficient transmission fluid can cause overheating and damage, potentially leading to this symptom. Check your transmission fluid level (following your vehicle's instructions carefully – the process differs between vehicles), but low fluid is only a symptom of a larger problem.
* Transmission Pump: A failing transmission pump might not be able to adequately circulate fluid, resulting in similar symptoms.
* Clutch Pack Issues: Worn or damaged clutch packs inside the transmission can prevent smooth shifting and might cause a locking sensation.
* Internal Transmission Damage: More serious internal mechanical damage within the transmission itself is a possibility.
Why NOT to attempt DIY repair:
Transmission repair is complex and requires specialized tools, knowledge, and experience. Improper repair attempts can cause extensive and costly damage. You risk:
* Further damaging the transmission: Incorrect procedures can worsen the existing problem, potentially leading to a complete transmission failure.
* Injury: Working on a transmission involves heavy components, high pressures, and hot fluids, all posing potential safety risks.
* Wasting money: You might purchase unnecessary parts or tools, and still not fix the problem.
What to do:
1. Do NOT drive the vehicle. Continuing to drive with a locked-up transmission will cause significant damage.
2. Have it towed to a qualified transmission repair shop or mechanic. Explain the symptoms clearly.
3. Get a professional diagnosis: Let the mechanic determine the exact cause of the problem.
4. Obtain a repair quote: Compare quotes from multiple shops if necessary.
5. Authorize the repair: Once you understand the necessary repairs and costs, proceed with the repair.
The cost of repair can vary greatly depending on the cause and the extent of the damage, ranging from relatively minor repairs to a complete transmission replacement. Getting a professional diagnosis is the first crucial step in determining the best course of action.
