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i had the similar problem with my civic r18, MT.
hard shift 1 to 2, downshift 3 to 2. N to 1 at dead stop.
I'm Tried to change the gearbox fluid to AMSOIL syncromesh. Helped a little but not really and my first gear was really bad.
flushed again with GM AC DELCO Syncromesh 'friction modified'
Seriously, ALL the problem was gone. all the gear shift like in the butter.


hope i can help someone
If you remember, did it ever go back it feeling hard dead stop to 1?
 

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Almost feels like mine rev drops too low.... then bounced back up real quickly... as if I have my a/c on and it clicks off

hard to explain but my car is bouncy And jumpy AF just rolling in 1st (no gas) and even worst when trying to shift.
 

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From the trans' ive pulled apart, all usdm 5 speeds habe carbon lined second gear synchros. Maybe yours is down to brass now. Or if you swapped in a jdm one only the 3rd gear has a carbon synchro.
 

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Maybe!.. the damn Asian auto shop in Vegas I bought my civic from sold me my car without a drop of oil on the dipstick soooooooo, assuming the trans could be low in fluid as well. Idk doesn’t seem normal is all I know with the amount of standard cars I’ve driven.
 
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