What are the disadvantages of 4-speed automatic transmission?

The main drawbacks of 4-speed automatic transmissions are concentrated in fuel economy and transmission efficiency. Their torque converter structure causes approximately 20% power loss, with urban driving fuel consumption being 10%-15% higher than manual transmissions. Structural complexity also leads to higher maintenance costs: routine transmission fluid changes cost about 300-500 ringgit, while major overhauls may exceed 3000 ringgit. Technically, 4ATs have a narrower gear ratio range (approximately 4.0:1) compared to modern 6AT (6.0:1) or CVT systems, causing higher engine RPM during highway cruising and consequently reduced fuel efficiency. Although mainstream models now increasingly adopt multi-gear transmissions, 4AT-equipped used vehicles retain market appeal due to their lower pricing (typically 5000-8000 ringgit cheaper than equivalent 6AT models).