Reverse has straight-cut gears which naturally make more noise than the forward gears, which are cut on an angle, and share the load of pulling between three teeth, not one at a time. If the noise happens just as you're letting the pedal out to engage the clutch, the throwout bearing is at least part of the problem.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!