Crash box transmissions are noisy, mostly because of the gears, especially in anything but high gear, not necessarily from wear or damage. Chances are a bearing change will get a lot more mileage out of the box, as long as there's not a great deal of deep rust pits to deal with.
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!