Mazda Forum - Mazda Enthusiast Forums - Mazda 929 Hardtop, rattling noise at deceleration

Hi,
I’am from Berlin, Germany, and i have a problem with my Mazda 929 Hardtop, Bj. '74, 125000 km, I spent a lot of money and time, but can’t solve the problem, maybe someone of you guys have an idea or knows this problem:

The car makes a rattling, chattering sound in the thrust operation (foot taken off the throttle) with approx. 3000 rpm, this happens only in the 3rd and 4th gear. In order to hear in the 4th louder than in the 3rd gear, as soon as the car goes back into the engine (if you go on the throttle) or you press the clutch-pedal, the noise disappears completely. A visual and "shake" test of the exhaust system, whether this strikes somewhere, showed nothing, it moves without contact in its suspension, also in the silencers is nothing to be heard whether there is something loose inside. At the drive shaft is nothing to see, the universal joints have no excessive play or look knocked out. Also, the shaft has no play.
This has been done so far:
- Differential overhauled, all bearings new, gearsets without damage
- Transmission (manual, 4-speed) overhauled, all bearings new, gearsets without damage
- both plug axles pulled, visual inspection of the wheel bearings, not new, but no play, no running noises.

Here you can hear the noise:

https://www.youtube.com/watch?v=8hW2...ature=youtu.be

Thanks a lot for any ideas,
Cheers,
Jens