M/T Countershaft Assembly Clearance Inspection
Measure the thickness of the 1st gear.
If the thickness of 1st gear is less than the service limit, replace 1st gear with a new one.
If the thickness of 1st gear is within the service limit, replace the 1st/2nd synchro hub with a new one.
Standard:
27.42−27.47 mm (0.902−0.904 in.)