Deep, that's a Muncie 3 spd, used by Chevy from 55-64 on their cars and trucks.It's very similar in design to the earlier 3 spds used on torque tube models.Your's has a rear mount so it's most likely from a 58 and up car.They all have the same 2.94 first ratio, except for the rare close ratio version with a 2.50 ish first gear.