I have the larger 7109 fel on a 2120, still a smaller rig than the 3930. It's rugged though newer ones will lift more. I don't think you'd want to put even a 7109 on a 3930. Still, as Rick says, you could!
Jim
Anything can be done given enough money and or time & talent. But a 7108 on a 3930 is just a bad idea. A 7108 is designed to fit a tractor with 2/3 the HP and 1/2 or less the weight of a 3930.