Did you replace the needle bearings or bushings that the gears ride on? Just changing the input and output ball or roller bearings probably won't quiet things down if the gears are wobbling around on worn-out needle bearings.
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!