Inspect gear teeth on all synchro hubs and the synchro sleeves for rounded off corners, which indicate wear.
Install each synchro hub (A) in its mating synchro sleeve (B), and check for free movement. Make sure to match the three sets of longer teeth (C) (120 degrees apart) on the synchro sleeve with the three sets of deeper grooves (D) in the synchro hub.

NOTE: Do not install the synchro sleeve with its longer teeth in the synchro hub slots (E) because it will damage the spring ring. If required, always replace the synchro sleeve and the synchro hub as a set.
Honda Fit 2007-2026 Navigation Online Reference Manual
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Precautions While Driving
NOTICE
Do not operate the shift lever while pressing the
accelerator pedal. You could damage the
transmission.
If the ignition switch is turned to ACCESSORY
or
LOCK while driving, the engine ...
Front Door Glass Outer Weatherstrip Replacement
NOTE:
Put on gloves to protect your hands.
Take care not to scratch the door and related parts.
Lower the glass fully.
Remove the door sash outer trim.
...