- Install the synchronizer locking ring on the driven gear cone and measure the dimension (a) with a feeler gauge.
| Size "a" | Admission of new parts | Wear limit |
| 4th gear | 1.0...1.7 mm | 0.5 mm |

| Size "a" | Admission of new parts | Wear limit |
| 4th gear | 1.0...1.7 mm | 0.5 mm |
