JD,
back in the day of rollin in the dirt wrenchin, for a pressure pate I went with tighter than heck an 2 more turns !..lol.. never had one get loose ..but Im sure someone will chime in with what the service manual says is correct.
for the trans i would guess the same tourqe value for the 5 speed would be just fine for the 3 speed 75lbs sounds bought rite.
Tim