"What are the most common problems with the 1991 Ford F-250 transmission?"

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Accepted Answer

The 1991 Ford F-250 with an automatic transmission is commonly associated with the **E4OD transmission**, which has several known issues based on forum discussions, technical reports, and Classic.com listings. Here are the most frequently reported problems:

1. **Transmission Slipping**:
   - Gears slipping under load or during acceleration, often due to worn clutch packs or low transmission fluid.

2. **Fluid Leaks**:
   - Leaks from the valve body, torque converter, or transmission pan gasket, leading to fluid loss and overheating.

3. **Overheating**:
   - Poor cooling system design in some models causes overheating, accelerating transmission wear.

4. **Torque Converter Issues**:
   - Stalling or erratic shifting due to torque converter clutch failure (a common TSB topic for Ford in this era).

5. **Valve Body Failures**:
   - Internal valve body leaks or clogging, leading to erratic shifting behavior.

### Recommendations:
- Check maintenance records for transmission fluid changes and repairs.
- Consider upgrading to a **remanufactured transmission** if the vehicle is driven frequently.
- For more details, you can explore [Classic.com's market page](https://classic.com/m/ford/f-series/8th-gen/f250/) for similar listings and trends.

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Lot 751-TUL: 1991 Ford F-250 XLT Lariat

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Lot 751-TUL: 1991 Ford F-250 XLT Lariat

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