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two things to look for, gear tooth wear and pitting/galling. A simple way to check for tooth wear is look at the 'rectangle' on top of the tooth..your large gear on your cluster does not get sliding gear wear,so it makes a good reference. Now look at the smaller gears on the cluster and the two sliding gears..is the rectangle tapered? if its tapered over half the tooth length replaced the gear.This is what causes it to pop out of gear,and noise.
Galling and pitting occur on the face of the tooth,and are 'load' failures,the hardness begins to degrade.This leeads to tooth failure and all kinds of damage.reject any gear with heavy pitting or lateral score marks (galling)
Reading the rectangle on the top of the tooth is valuable when buying used transmissions,often you cant see the tooth face on the cluster clearly when its assembled,the rectangle is a tell tale..