Vibration felt through floor

[cupo]

Got a strange vibration felt through floor whilst driving while accelerating as soon as u let off it goes took both front drive shafts out but still the same anybody have a clue or hade symptoms kzn130 auto cheers

[Darrie]

2 things I can think of - a failed engine mount (engine shifts position when under load on the mounts), or the universal joints in the rear tail shaft are worn.
Torque converter failing is another uncommon one, but can happen.

[Melhks]

I out a new back box from rough trax and thats hits the floor when under load