Synchronizer Ring Clearance
Check synchronizer rings for wear or damage. Turn and push ring to check braking action. Measure clearance between synchronizer ring back and gear spline end; 1st and 4th synchronizer ring to gear minimum clearance is .024" (.61 mm). 2nd and 3rd synchronizer ring to gear minimum clearance is .028" (.71 mm). If clearance is less than specification, replace synchronizer ring. See Fig 1.