(a) Check for wear and damage.
(b) Coat the 4th gear cone with gear oil.
(c) Turn the synchronizer ring in one direction while pushing it against the 4th gear cone.
(d) Check that the ring locks.
If the synchronizer outer ring does not lock, replace the synchronizer ring.
(e) Using a feeler gauge, measure the clearance between the synchronizer ring back and the gear spline end. Standard clearance:
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