The Ford F650, equipped with a Cummins engine, is a popular choice for those needing a powerful and dependable medium-duty truck. While older 4-speed transmissions like the 46RE and 47RE (built to 48RE specifications with upgrades) can be reliable with proper maintenance and modifications, the 68RE six-speed transmission offers improved performance and efficiency. Many report high mileage with minimal issues from these older transmissions, especially with regular servicing. Preventative maintenance, such as frequent transmission fluid changes, can significantly extend the life of these components. Addressing potential problems before they become major breakdowns is often more cost-effective in the long run.
One user shared their experience towing heavy loads with a modified 2005 Ford F650, accumulating nearly 300,000 miles on a rebuilt transmission. This anecdote highlights the potential longevity of these powertrains when properly maintained. They emphasized the importance of proactive maintenance, stating that one breakdown can easily outweigh the cost of preventative repairs.
While Allison transmissions are widely regarded as a top choice for heavy-duty applications, and conversions for Ford trucks are available, they often come with a higher price tag. The Cummins engine paired with a well-maintained Ford transmission provides a robust and more affordable alternative. Even with a 22-foot one-car trailer and heavy equipment like Kubota diggers, the Ford F650 Cummins combination delivers impressive towing capabilities.
However, overheating can severely damage transmissions. One owner experienced a transmission failure at 95,000 miles due to repeated overheating by the previous owner. Maintaining proper operating temperatures, especially when towing heavy loads uphill, is crucial for long-term reliability. Keeping transmission temperatures below 180 degrees Fahrenheit, even under stress, is a good practice.
Overall, the Ford F650 with a Cummins engine provides a solid foundation for a dependable work truck. Coupled with diligent maintenance and attention to operating temperatures, this combination can offer years of reliable service. While the Allison transmission might be considered superior, the Ford powertrain remains a viable option for those seeking a balance of performance and affordability.
