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5th gear syncro grind

Old 02-28-2018, 10:31 AM
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Default 5th gear syncro grind

Did anybody over the years ever disassemble their gears and syncros to find out what causes the common 5th gear syncro grind that a bunch of RD owners get after some time? Was it just bad engineering on Hyundai's part or was it found to be something else that causes it?
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Old 03-01-2018, 08:59 PM
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Doodoo syncro's or bad oil. I am NOT a fix from a can sort of person but - .. flush it with Redline MT-90 and see if that doesn't help

Flush a manual are you crazy?

From hyundai's TSB on the Genesis. Get a bunch of Redline MT-90 (they didnt say use Redline.. but anyway)

Drain trans

Put new fluid in - reuse old crush washers

drive for 100 miles or so.. shift a lot.. get the oil good and moved around.


refill with fresh oil

install new crush washers with this one.

If that doesn't work its either time for a new trans or tearing what you have apart.
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