Thump/Vibration in rear

[SVX JAZZ]

Hi gang,

Driving home last night I noticed each time I took off from a standing stop, there seemed to be a thump shound coming from the rear of the car. It almost sounded like something shifting around. I have also been noticing a low pitch vibration during speeds up to 50 mph. Any higher and the vibration goes away. Could this be related?

Thanks,

Paul,
You might want to check your rear differential mounts.