In any car generally pre '80s, the torque converter is usually rather stiff. Like when shifting from a neutral non driving gear to a driving one, the rpm should drop a bit instead of just 20 rpm as it currently does in beam. The worst offender of the this current behavior is when the car is on the move; The converter should not allow the rpm to lower so much when moving at speed, and give it a second or so it drops completely to idle (depending on speed/ final drive). In reality it it shouldn't create a noticeable drop after like 20mph~ (again depending on final drive). Why is it that older converters aren't simulated ? is it the added complexity of keeping more things up to date (the same issue with non sycromesh 'boxes), is it that no has noticed ? or something else ?