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Why is the power different after changing the transmission?

2 Answers

DeViolet

07/29/25 8:28am

The reasons for the difference in power after changing the transmission are as follows: Incorrect use of transmission fluid: Before replacing the automatic transmission fluid, the vehicle should be parked on a level surface with the handbrake engaged and the gear selector in the P position. Prior to draining the ATF, the transmission should be warmed up to operating temperature (or the fluid should be changed after driving) to reduce the viscosity of the fluid and ensure that impurities and sediment are drained along with the fluid. Open the drain plug to release the fluid, and carefully inspect the condition of the ATF to analyze the state of the automatic transmission. Issues with the transmission valve body: If the transmission valve body is damaged, it may cause sticking. If there is a leak, it can lead to gear shift shock during the shifting process, significantly reducing shift efficiency and also causing a decrease in the vehicle's power. Mismatch between the transmission computer and other computers: Changing the transmission requires program matching because the computer needs to better control the transmission by adjusting the current values of various solenoids to ensure the transmission outputs power more effectively.

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Ora

08/12/25 5:30am

I just had my transmission replaced and noticed a change in the car's power. It feels awkward to drive. The new transmission model might not match the original car, or the screws or pipes weren't tightened properly during installation. Too much or too little fluid can affect cooling. The car's computer control unit needs to be reprogrammed; if the shift points and torque parameters aren't set correctly, acceleration can feel weak or jerky. Loose sensor connections or uncleared fault codes can also cause issues. Go back to the repair shop for a check-up and adjustments as soon as possible—don't take it lightly. Unstable power can accelerate wear on other components, making driving unsafe and prone to unexpected failures. It takes some time to adapt to a new transmission, but significant differences should never be ignored. Last time my car had this issue, a thorough inspection by the technician restored normal operation.

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