* Transmission type: This is the most common way people refer to transmission "size." A 2000 Ford Expedition likely has either a 4R70W (4-speed automatic) or a 5R55E (5-speed automatic), depending on the engine and options.
* Physical dimensions: This is less common, but you could measure the transmission's length, width, and height if you had it removed from the vehicle. This isn't typically a necessary measurement.
* Gear ratios: This refers to the internal ratios within the transmission. You would need a detailed specification sheet or shop manual to find this data.
How to determine the transmission type (most likely what you want):
1. Check the Vehicle Identification Number (VIN): The VIN contains coded information about the vehicle's specifications, including the transmission. You can use a VIN decoder (many free online services are available) to determine the transmission type.
2. Look at the transmission itself (requires removing some parts): If you can access the transmission, look for a tag or marking cast into the transmission case. It might have a code (like 4R70W or 5R55E) that identifies it. This requires some mechanical skill and potentially removing parts from the vehicle.
3. Check your owner's manual: The owner's manual *might* list the transmission type, but it's not guaranteed.
4. Ford's website or a parts website: Using your VIN on the Ford website (or a parts website like AutoZone, Advance Auto Parts, etc.) might reveal the original transmission specification.
In short, the best and easiest way is to use the VIN decoder to find the transmission type. That will tell you the most relevant "size" information. Measuring the physical dimensions or finding the gear ratios is much more involved and usually unnecessary.
