4.8 if only filter and drain,
7.4 for overhaul, WITH +/- dry converter
Use only Dextron/MerconIII, or what is it up to now V? ATF.
If it has been a complete overhaul, I would put in the 4.8, get it up to running temp, and check/add as needed.. You HATE to overfill the aw4....