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The HD4650 you are going to need a harness, TCM, selector, the little throttle module that only I've seen on the 916A0E1s and 915A4s that controls the transmission based on throttle response. It looks like a cruise control module. Not to mention the 10 to 14k price tag for everything vs a $2000...
The HT740 is an automatic 4spd. It's just not computerized like what you saw in the LMTV or the allison 4560s etc. Has no electronics in it. Uses a cable on the throttle linkage to control servo pressure
Transmission is manual shift 4spd. No controller. No computer. Just a modulator cable which is easily found and a tower shifter.
Torque converter is in the transmission along with the flywheel teeth.