If the bevel gears were straight cut you would expect them to be noisy.
They are however, spiral bevels, which by their nature are supposed to reduce noise and vibration.
I cannot believe that Quaife were "treading new ground" when the bevel boxes were designed and produced for MMC.
I would assume that the spec MMC supplied to Quaife was with regard to overall shape and dimensions including mounting details, reduction ratio and power/torque capabilities, but full details of the internals, I am pretty sure would have been left to Quaife to sort out.
How did they get it so wrong?
