The transmission code identifies the exact transmission in your vehicle. Two transmissions that fit the same model can have different gear ratios, internal parts and electronics, so the code is the most reliable way to match a replacement. Here is where to look.

1. The tag or stamping on the case

Most transmissions carry an identification tag, sticker or stamped plate on the case. Common places are the side of the case, near the bellhousing, above the oil pan or on the tailshaft housing. The tag often shows a model code, a part or assembly number and a serial number. Dirt and oil can hide it, so clean the area gently and take a clear photo.

2. Build labels in the vehicle

Some manufacturers list transmission information on a label in the driver door jamb, the glove box or the spare-tire area. These labels use the manufacturer’s own option codes, so the transmission may appear as a short code rather than a model name.

3. Your VIN

The 17-character VIN does not always spell out the transmission, but it identifies your exact vehicle, including the model year, engine and drivetrain. Suppliers can often work out the original transmission from it. The VIN is on the driver side of the dashboard, the driver door jamb and your registration.

4. Paperwork and service records

Window stickers, build sheets, previous repair invoices and dealer service records may list the transmission. A dealer service department can usually look it up from the VIN.

What to send when you need a replacement

Your VIN
A photo of the transmission tag or stamping
The engine size or code it is paired with
Whether the vehicle is FWD, RWD, AWD or 4WD
Automatic, manual or CVT, and the number of speeds if you know it

If the original transmission was replaced at some point, the unit in the vehicle may not match the VIN. That is another reason a photo of the tag helps.

Need a transmission? Send your VIN and transmission code for transmission sourcing, or browse used transmissions.