Good news everyone!
The registry build dates are complete! Now I know there may be one or two at the very end of some of the years and that is possibly due to no VIN provided, duplicate post or the VIN was giving issues.
I've learned a lot from this and saw some very nice optioned trucks and some really base models. On to the next project of decoding sales codes and hopefully body models.
I would like to thank JMO for assisting me greatly in this endeavor. He provided info for the '89 and up builds, way more info is available for those years. I would also like to thank everyone else who stuck their hand in the cookie jar on this project, especially Minuit who provided and build sheet with a contradictory build date of the next day and a big thanks to Eagle who provided me some more build sheets to study over and examine.
Inconsistencies I've noticed along the way, VINs do not go in order, so there could be 2-5 XJ's in between each MJ VIN. VIN that ends in GT000001 is an SJ. GT000816 to 820 is I believe the first MJ's that rolled out, VIN as 815 is an XJ and before that is XJ's
I'll find out the last 92 in my travels.