Brado

I have a new ba xr6 beautiful. However when foot is off throttle and decelerating from about 65 to 55 a low drumming noise occurs. It also happens from about 100 through to 90. If throttle is applied during this period the noise goes away unless acceleration is stopped. Any help would be appreciated or if anyone else has same problem as ford does not seem to know what it is

mongrelEB

I'm going to suggest tailshaft balance. Have gearbox/diff fluid levels been checked?
The BA diffs apparently also have backlash issues but I know little about diff internals

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Pacemaker headers + 2.5" exhaust
EF Fairmont interior
MP3 player
Lowered King springs
5 speed manual
EF motor

Newest mod: EF Ghia wiring loom and dash