Mercedes-Benz W639 manual gearbox shifting and second gear
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W639 manual: second gear will not go in or crunches when cold, what is the fault?
The gear lever shifter joint may be worn and give longitudinal play. Replacing the joint removed the play and improved shifting. Replacing the cables was not needed.
Does changing the gearbox oil help a sticking second gear?
An oil change alone does not usually remove the symptom. However, too much oil in the gearbox can make second gear stick, so check that there is not too much oil.
First gear will not stay in: is the synchro ring the cause?
The synchro ring affects gear engagement, but it alone does not determine whether the gear stays in. Check the shifters for worn parts, the spring and the linkage adjustment.
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