How do you know if a upper gearcace is good

[Puppet boat]

I need to buy a new/used uppergear case for my OMC electric shift outdrive. <br /><br />How do I check to see if they are in good shape (gears) with out taking it a part. Is that possible

 

[Bondo]

Re: How do you know if a upper gearcace is good

Shake,<br />Wiggle,<br />And<br />Roll the Dice......................