Transmission Code Guide

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As explained in the Part Numbering Guide, the Base of a part number (disregarding any Prefix letters it might have), begins with a 2- or 3-digit number that signifies the transmission unit that the particular part fits. This is called the Transmission Code.

For example, rebuilder kits and replacement parts for a GM 4L60E will begin with a "74", while part numbers for a CD4E will begin with a "96".

To view the complete Transmission Code Guide, click on Download above.