The transmission gears should outlast the life of the vehicle, but abuse can easily
damage them. Extreme damage would prevent shifting into a particular gear.
Transmission gears can chip and damage teeth, which will hinder proper engagement
Be aware that bad synchros can also hinder proper shifting, but either transmission
components will require a transmission rebuild. If the shifting problems are
isolated to a particular gear, then it's most likely the synchro or the gear.
FC3S Pro: Problems, Components - Transmission, Synchros
If you're experiencing problems shifting into all gears, try swapping the transmission
FC3S Pro: Problems, Components - Transmission Fluid
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