muncie 's are very simple . things to look for are obviously any broken gears, bad bearings (pitted or excessive play),the teeth on all the gears that your syncro assemblies interlock to .a diamond shape is perfect , a used unit will tend to be worn down
dont overlook all the slides dogs, and blocker rings(syncronizers)another thing about muncies is the case where the countershaft rides tend to wear , check for side to side slop and egg shaping.