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Caveat: please confirm the following information is correct for your vehicle and model before performing this procedure.
From ChatGPT:
The Ford 8F35 transmission relearn cycle typically takes about 15 to 30 minutes. This process involves driving the vehicle in a specific manner to allow the transmission control module (TCM) to adapt to the transmission's characteristics and optimize its performance. Here are the general steps:
1. **Warm-Up**: Ensure the engine and transmission are at normal operating temperature.
2. **Low-Speed Driving**: Drive at low speeds, usually in the range of 20-30 mph, to allow the transmission to learn the shift patterns.
3. **Moderate Acceleration**: Perform a series of moderate accelerations from a stop to about 50 mph, allowing the transmission to shift through all gears.
[EDIT] From Mark S: “My Bronco Sport will not upshift to 8th gear until 63 mph. Once in 8th, I can slow to around 55 mph or so and it'll stay there, but as soon as you attempt to accelerate--no matter how slight--it'll downshift.”
4. **Deceleration**: Allow the vehicle to decelerate naturally without braking from about 50 mph to a stop.
5. **High-Speed Driving**: Drive at highway speeds (55-70 mph) for a short period.
6. **Stop-and-Go**: Engage in stop-and-go driving to ensure the transmission can adapt to frequent shifts between lower gears.
Following these steps consistently over the 15 to 30 minute period should help the TCM learn and optimize the shift patterns for the Ford 8F35 transmission. It's important to refer to the vehicle's service manual or consult a professional technician for specific procedures and recommendations for your particular model.
Also see:
https://www.broncosportforum.com/forum/threads/resetting-the-ford-8f35-transmission.11466/
From ChatGPT:
The Ford 8F35 transmission relearn cycle typically takes about 15 to 30 minutes. This process involves driving the vehicle in a specific manner to allow the transmission control module (TCM) to adapt to the transmission's characteristics and optimize its performance. Here are the general steps:
1. **Warm-Up**: Ensure the engine and transmission are at normal operating temperature.
2. **Low-Speed Driving**: Drive at low speeds, usually in the range of 20-30 mph, to allow the transmission to learn the shift patterns.
3. **Moderate Acceleration**: Perform a series of moderate accelerations from a stop to about 50 mph, allowing the transmission to shift through all gears.
[EDIT] From Mark S: “My Bronco Sport will not upshift to 8th gear until 63 mph. Once in 8th, I can slow to around 55 mph or so and it'll stay there, but as soon as you attempt to accelerate--no matter how slight--it'll downshift.”
4. **Deceleration**: Allow the vehicle to decelerate naturally without braking from about 50 mph to a stop.
5. **High-Speed Driving**: Drive at highway speeds (55-70 mph) for a short period.
6. **Stop-and-Go**: Engage in stop-and-go driving to ensure the transmission can adapt to frequent shifts between lower gears.
Following these steps consistently over the 15 to 30 minute period should help the TCM learn and optimize the shift patterns for the Ford 8F35 transmission. It's important to refer to the vehicle's service manual or consult a professional technician for specific procedures and recommendations for your particular model.
Also see:
https://www.broncosportforum.com/forum/threads/resetting-the-ford-8f35-transmission.11466/
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