Is there any play in the shifter shaft ? The other issue would be the gears not wanting to slip on the shafts inside to switch gears. If it goes hard enough the shift fork can bend and you'll have some grinding when running second(the first gears won't completely disengage with enough clearance. Try a different oil for one change ,maybe add a half cup of ATF to clean any grunge that may be causing sticking inside. Drain the oil shortly to not leave the ATF in for too long.
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