Did not check parts book, as I have the download of the only complete manual close to the '84 year, and that was the '82 manual.
Will look there to see what it shows.
Best I could find was the breakdown of the Chrysler 10,000 day calendar, that should be the date I posted above, and that the shaft appears this is a non-lock up.
As said, this is a spare trans that came with the truck, so trying to help identify it for someone who might use it for rebuild.
I can only guess why the PO would keep it, but did find receipts that he did have some trans/TC troubles in the late '90's, with last year truck registered was '04.
Hope he resolved the issues back then, and I do understand it is best to go through an auto trans after sitting so long, as it reduces the chance in the break down equation later.
Thought about keeping it, and try my hand at rebuilding it with my teen grandson, but do not plan to run the truck as hard as the PO might have off road, so should be ok with just one trans.....the one in the truck now!
My use will be mostly highway miles, but pulling a camper and gear, so want trans in tip top shape.
Thanks all for input so far
Note, more pics on Classifieds
'81 CJ5 Base, 258 I6, MC2100, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31, 4" high arc spring lift
'84 Grand Wagoneer, 401 V8 (.030 over), MC2150 HA Comp, 727 auto, Selec-trac NP229, AMC 20 REAR - D44 FRONT - WT 3.31, 4" high arc spring lift
Rather be driving, than waiting to be modified