Synchronizer Components: Notes

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

If the contact surfaces of coupling sleeves, synchronizer hubs and shifting inserts have damage or abrasion, replace the component.
Each set of coupling sleeve and synchronizer hub should move smoothly.

Fig 1: Inspecting Synchronizer Hubs And Shifting Inserts For Damage Or Abrasion
Courtesy of NISSAN MOTOR CO., U.S.A.
If the cam surfaces of baulk rings or contact surfaces of shifting inserts have damage or excessive wear, replace with a new one.
If spread springs are damaged, replace with a new one.

Fig 2: Inspecting Contact Surfaces Of Shifting Inserts
Courtesy of NISSAN MOTOR CO., U.S.A.