What exactly do you mean by banging?
A mechanical, metalic sound from a gearbox, as if something has broken or come loose?
Or a suspension-related sound, as if something is moving about too much on its mountings and causing a thumping noise or vibration?
If it wasn't that you've said all the suspension bushes have been replaced I'd have said worn reaction arm bushes, letting the rear axle tramp excessively in low gear, and bumping the front of the diff against the rubber bump-stop.
Or a very worn rubber prop doughnut, letting the prop whiplash around under low speed torque or oscilate at certain revolutions.
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