
The transmission in the XT4 is independently developed and produced by General Motors. SAIC General Motors Co., Ltd., established on June 12, 1997, is a joint venture between SAIC Motor Corporation Limited and General Motors Company. It has four major production bases: Pudong Jinqiao, Yantai Dongyue, Shenyang Beisheng, and Wuhan Branch, comprising four vehicle assembly plants and two powertrain plants, making it one of the significant enterprises in China's automotive industry. The Cadillac XT4 utilizes a 9-speed automatic manual transmission, which features eight forward gears. Essentially, an automatic manual transmission is a traditional AT or CVT transmission with added manual shifting capability. The purpose of this transmission is to enhance the driving pleasure of automatic vehicles. When using the Cadillac XT4's transmission in daily driving, the following points should be noted: Do not delay changing the transmission oil for extended periods. Although many models now feature maintenance-free transmission oil, 'maintenance-free' does not mean it never needs replacement. Prolonged failure to change the transmission oil can damage internal components such as bearings and the housing. Avoid coasting in neutral for long durations. While many experienced drivers coast in neutral when driving manual transmission vehicles, doing so in an automatic transmission can cause overheating. Additionally, shifting back into Drive (D) mode may result in a noticeable jolt. Never shift into Drive (D) or Reverse (R) before the vehicle comes to a complete stop. Many drivers attempt to showcase 'smooth' operation by shifting into reverse while the vehicle is still moving, which can severely damage the transmission gears and, over time, lead to gear grinding and other failures. Avoid frequently climbing steep slopes in Drive (D) mode. Automatic transmission vehicles often overheat under high loads or shift prematurely, leading to insufficient power when climbing steep slopes. In such cases, using manual mode to lock in lower gears or switching to sport mode can help protect the transmission. Do not tow the vehicle over long distances. If an automatic transmission vehicle breaks down, it should be transported using a flatbed tow truck with the transmission in Neutral (N). Using a tow rope or towing the vehicle directly is not recommended.

I've been driving my XT4 for over two years and am very satisfied with its transmission. The car comes with a 9-speed automatic transmission that operates exceptionally smoothly, whether in city traffic congestion or highway cruising, with no noticeable jerking. The response during acceleration is intelligent - it downshifts immediately when you floor the accelerator, giving great confidence for overtaking. Once I drove continuously for five hours on the highway without any transmission overheating warnings, proving its excellent reliability. While many new cars now use dual-clutch or CVT transmissions, I think XT4's insistence on traditional automatic transmission is wise, as AT technology is mature, durable and requires less . Despite having multiple gears, the fuel consumption is well controlled at around 9L/100km in mixed driving conditions.

As a tech enthusiast, I really appreciate the transmission design of the XT4. It uses GM's in-house developed 9AT with a gear ratio range of 7.6:1, which provides stronger low-speed acceleration and better fuel efficiency during high-speed cruising. In actual driving, the shift logic is very intelligent, capable of predicting driving intentions based on throttle input. I've specifically tested the manual mode, and the paddle shifters respond within 0.5 seconds, making it quite exciting on track days. The transmission oil cooling system is well-designed, keeping the oil temperature around 90 degrees even during aggressive driving. The only drawback is a slight hesitation in second gear during cold starts, but this completely disappears once the car warms up.

As a female car owner, the XT4's transmission makes driving effortless for me. The nine-speed automatic transmission handles daily commutes without any need to worry about shifting. What I appreciate most is its smoothness; frequent stops and starts when picking up and dropping off kids near school zones are completely jerk-free. On rainy days with slippery roads, the transmission works seamlessly with the four-wheel-drive system, ensuring no slippage. Once during a long drive, a sudden heavy downpour occurred, and the automatic downshifting was incredibly timely, providing a strong sense of . Maintenance is straightforward too—just change the transmission fluid every 15,000 kilometers as per the manual. Now with 60,000 kilometers driven, the transmission has never had any issues.

Our fleet has three XT4s, and the transmission has withstood high-load challenges. This specially calibrated 9AT transmission actively upshifts to maintain low RPMs during city driving, delivering noticeable fuel efficiency. Yet, it can swiftly downshift three gears in a row when tackling mountain curves, ensuring crisp exits. Once, while transporting filming equipment on rough terrain, the low-speed crawl mode kept the transmission in 1st gear, avoiding frequent shift shocks. A colleague's XT4 has clocked 150,000 kilometers without major transmission overhauls. If there's any regret, it's the lack of a sportier shift program, but it's more than sufficient for daily use.


