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Well if it is an accelerator position related whine then you might have two worn differentials
(The larger cases are not for lower gearing they are just better made)
As for tightening the pinion bearings to try and make that less of a problem it probably won't help much (even if you can get the pinion bearings tighter) partly because
1) the pinion bearings once worn won't actually get tighter within specification - well weird - they just won't - don't know why - even the FSM says once the desired friction can not be obtained you just have to replace the bearings
2) the position of the pinion gear running against the crown wheel is what is making the whine - pinion gear in wrong position == chances of whine + + +
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