If you put it in drive and it shifts automatically it does NOT have a manual valve body scope
it it won't shift by itself in any other gear it is a manual shifted tranny due to the valve body scope
If it is NOT a manual valve body it will hurt and damage the tranny very quickly without the kick down linkage hooked up and adjusted properly scope
The kickdown lever is used to hold the shift lever seal in place to stop it from weeping and or leaking around that shaft and the shift lever shaft is what I'm remembering now.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)