I'm pretty new to the RV world and looking at Ford-based motorhomes. I'm converting a half ton pickup into a motorhome and want 4x4 capability. I keep seeing references to different 4-speed automatic transmissions like the 4R70W, E4OD, and 4R100, but I'm honestly confused about which is which and what the differences are.
I'm trying to figure out which transmission would be most reliable for my needs. Some people mention the 4R70W while others swear by the E4OD or 4R100. Do these vary by year or engine size? And is there a clear winner in terms of dependability, especially for someone who might be doing some towing and converting a pickup?
Any guidance would be really appreciated - I feel like I'm drowning in transmission model numbers and don't want to make the wrong choice!
Ford motorhomes typically use the 4R70W, E4OD, or 4R100 4-speed automatic transmissions depending on year and engine. The 4R70W is most reliable for lighter duty, while the E4OD/4R100 handles heavier loads better.
Find these on Amazon: Transmission Fluid , Transmission Cooler , Temperature Gauge
For most Ford motorhomes, the 4R100 offers the best combination of durability and torque capacity for heavy-duty use, while the 4R75W provides better fuel economy and smoother shifting for lighter applications. Choose based on your motorhome's weight, engine, and intended use.
Ford motorhomes equipped with 4-speed automatic transmissions typically use the 4R70W, 4R75W/4R75E, E4OD, or 4R100. The specific transmission depends on your chassis year, engine size, and gross vehicle weight rating (GVWR).
The 4R70W is commonly found in lighter Ford motorhomes and was the evolution of the AODE. This electronically controlled transmission pairs well with 4.6L and 5.4L engines. It's known for smooth shifting and reasonable reliability when properly maintained.
The E4OD (later renamed 4R100) is the heavy-duty option found in larger Ford motorhomes, especially those with V8 engines and higher towing capacity. These transmissions are built for torque but require more maintenance and can run hotter under heavy loads.
Contact a transmission specialist if:
Professional installation ensures proper torque specifications, fluid levels, and electronic calibration.
Regardless of which transmission you have or upgrade to, follow these maintenance practices:
Help us improve this article by flagging technical issues or inaccuracies.
Was this guide helpful?
Try our free RV calculators and tools to help diagnose and plan your repairs.
Browse RV ToolsWeight calculator, electrical planner, propane estimator & more