I have a 1999 f-350 powerstroke. Where can I find out if it is an early '99 or a late '99?

 

There is a sticker on the drivers side valve cover on engine which is best for the engine itself. It has a serial number as well as a build date.

Drivers side door jamb.

 

Thanks, I figured it would be easy. Time to start looking at injectors. Do you happen to know the difference between AB and AD?

 

Copied and Pasted from the RiffRaff site:

AA - '94-'97 Non-California trucks. They are all 90cc injectors and are single shots.
AB - '97 California, and all Early '99 trucks. Split Shot injectors that flow 130cc of fuel.
AC - Came in high torque version of the T444E and didn't come in any Powerstrokes. They have the same internals as the AB injectors with the exception of the single shot plunger and barrel and are 160cc.
AD - These are found in all late '99-'03 Powerstrokes and T444Es, and are a Split Shot Injector
AE - Long lead AD injector that was used to cure a "cackle" issue.