A999 transmission identification number

[glhx]

4431556

87 custom high roof van, fully loaded
318
Lock up clutch wi5 single wire coming out of the back port.

Has a 904 torqueflite.
The chart doesn’t go up high enough to identify it.

Is this a 999?

Does it have the lower gear set

 

[VOETOM]

4431556 1987 5.2 L 999 Low Stall, Elec LU, Long Ext., to 11-87