You cannot determine if a Mopar vehicle is "numbers matching" prior to mid-1968 or so. Prior to that Chrysler did not stamp the VIN on either engines or transmissions, so there is not way to determine if those units were installed at the factory the day the car was built. Of the numbers stamped onto the transmission, the transmission assembly number is in the first set. Thus "19499 904" is the assembly number and it is for a 1961 Torqueflite used on 1961 Imperials (as well as Dodge Polara, DeSoto, all Chryslers, and HP Plymouths and Darts) . It was also used on 1960 HP Plymouths and Darts. Bill Vancouver, BC ----- Original Message ----- From: Rob Kidd To: mailing-list@xxxxxxxxxxxxxxxx Cc: Rob Kidd Sent: Wednesday, April 20, 2005 5:18 AM Subject: IML: 61 Transmission Build Date Hello, I have my 61's transmission out and ready to be rebuilt. How can I tell if it is the original -numbers matching one that came with the car from day one? The numbers on the side of the pan lip are; 1949904U2.5 1722128 Can these numbers be decoded to show the build date? Thanks, Rob Kidd 61/65 ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm