I've just had a quaife semi-helical 5 gear set built in v5 case. Forward gears are fine with quiet whine when under load But reverse makes a very loud whine.Even loader than what i would expect a straight cut. When rolling with clutch in its still whining allow quieter but more clanky.Is this the norm for this box.Thanks

 

Did you ever get to the bottom of this one - my scoob has just started doing the same.