How to identify a non lockup A999 transmission with pics!

Excellent information rmchgr! This helped me tremendously to identify my A999, I wanted to share some pictures and add a little more information to this thread. I have a 1984 AM General FJ8C which used to be a postal delivery vehicle. It has the 4.2L (258) inline six engine mated to A999 transmission.

The part number on the pan rail is PK5995949.



This is a non lockup model as shown by the input shaft:



Upon tear down I verified it has the 5 forward clutches, and stepped sun shell. It also has the 38 / 28 tooth sun gear as fishy68 pointed out! The valve body for me was the problem...

Here is the overall Valve body assembly, you can see there is no hydraulic lockup tube, or solenoid (being this is a non lockup A999)



The lower valve body is part number 4130495



The upper valve body is part number 4202528



I know the vehicle this was in is not an A body, and this post was a few years old, but I hope everyone can look past that for the sake of adding a little more information about the elusive A999 and its applications.