Float a motor

[George Miller]

Yes, yes, yes
The drive shaft is fasten to the engine with a solid torque. Which keeps the rear axle from moving forward or back. When you hit a bump with one of the tires it tries to move the end of the torque tube in a ark. the transmission and engine have to hold it. The later cars from Ford had the torque tube and transmission connected to frame cross member.
Modern cars use a open drive with a different axle mount. It is different animal altogether.