You won't need an adapter if you get a Chev TH400 with the right case already on it. (I see them for less than $200 on CL) Rebuild your old trans and put the Chev parts on the AMC case (or find one that needs rebuilding)
"Usually found in a Jeep near Reiter, WA"
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'81 Eagle wagon with upgrades $2500
'87 Comanche shortbox 4.0/AW4/NP242 on 33" tires $3500