Here's why:
* Whining Noise: This often indicates a problem within the transmission's internal components, such as worn bearings or a failing torque converter. The whine is likely exacerbated under load (taking off).
* Lack of Power on Takeoff: The torque converter is responsible for smoothing out power transfer from the engine to the transmission. If the torque converter clutch isn't engaging properly or is slipping, you'll lose power, especially at low speeds where it's most important. The engine might be revving high but the car isn't accelerating because the power isn't efficiently being transferred to the wheels.
* Fine at Higher Speeds: Once the car is up to speed, the transmission might be shifting into higher gears where the issue with the torque converter is less noticeable or the engine's power overcomes the slippage. The transmission could also be bypassing the problematic component at higher speeds.
Other possibilities, though less likely given the symptoms:
* Low Transmission Fluid: Check the transmission fluid level and condition. Low fluid or severely contaminated fluid can cause similar symptoms.
* Transmission Solenoid: A faulty transmission solenoid could be preventing proper shifting, although this is less likely to cause a whining noise.
* Internal Transmission Damage: More serious internal damage within the transmission is possible, but the symptoms suggest a problem with the torque converter as the primary suspect.
What to do:
1. Check the Transmission Fluid: This is the easiest and cheapest thing to check first. Look for the correct level and color. Dark, burnt fluid is a bad sign.
2. Get a Professional Diagnosis: Take your car to a qualified transmission specialist or mechanic. They have the tools and expertise to diagnose the problem accurately, which could involve:
* Fluid and filter change: A simple fix if the problem is dirty fluid.
* Torque converter replacement: If the torque converter is found to be faulty.
* Transmission rebuild or replacement: In case of more extensive internal damage.
Ignoring the problem could lead to more significant and costly damage to the transmission. Get it checked promptly.
