1. Look for the Transmission Identification Tag:
* Location: The most reliable method is to find the transmission identification tag. This tag is usually located on the transmission case itself, often on a side or top surface that's easily visible once you're under the car. It will have a series of numbers and letters that can be cross-referenced.
* Cleaning: You might need to clean the area to see the tag clearly. A wire brush and some degreaser can help.
2. Check the VIN (Vehicle Identification Number) and Build Sheet (if available):
* VIN: The VIN contains coded information about the vehicle's specifications, including the transmission. You can decode the VIN using online resources or a decoding service. However, this won't give you the *exact* transmission type, just the type it *should* have. There's always a chance of a replacement at some point in its life.
* Build Sheet: A build sheet (if you can find one for your car through Dodge historical records or a previous owner) will definitively state the original transmission. This is the most accurate, but hardest to obtain.
3. Visual Inspection (less reliable):
* Shift Linkage and Case: You can get some clues from visually inspecting the transmission itself. While not definitive, some differences in the case shape, shifter linkage arrangement, and the number of linkages connected can offer hints. Pictures of different transmissions online can be helpful for comparison. However, this is the least reliable method and is prone to error.
* Transmission dipstick: The transmission dipstick itself may have markings (though usually not the model number).
4. Examine the Drivetrain:
* Drive Shaft: The type of drive shaft (length and diameter) can sometimes provide clues to the transmission type as certain transmissions were paired with specific drive shaft lengths.
Once you have the identification number (from the tag):
Use online resources or a Dodge parts manual to decode the numbers. This will give you the precise model and type of automatic or manual transmission. For example, you might find it's a 727 TorqueFlite (common in '73 Chargers) or a different automatic, or a manual transmission like a 4-speed or 3-speed.
Important Note: Getting under the car to check the transmission requires some basic mechanical knowledge and appropriate safety precautions. If you're not comfortable doing this yourself, consult a mechanic.
