Part Numbering GuideDownload >>The Part Numbering Guide is a reference document that explains our part numbering system of using a variable prefix, base number and suffix that when broken down will tell you the application, type of part, and additional information such as type of material. Since the logic of this system is applied across the board, it is very easy to learn once you understand how it is set up.
The part number may start with Prefix Letters which refer to various part differences such as the level of the part's origin. A given hard part, for example, could have the prefix "D" for the Original Equipment part, an "A" if it is New Aftermarket, or "AR" for Remanufactured.
The Base Number is made up of two components. It starts with a 2- or 3- digit number that tells you the transmission application, "36" for an E4OD for example, followed by 3 digits that tell you the commodity of the part - "354", for example, tells you that the part is a 3-4 Accumulator O-Ring. For the complete list of transmission code numbers, please refer to the Transmission Codes Guide also listed in this section.
Suffix Letters refer to part differences such as the part's position in the transmission or its material composition. A pan gasket with an "F" suffix, for example, is made of Fiber, whereas one with a "W" suffix is Bonded.