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Just saw a leak underneath my car and thought it was a transfer case leak but it was actually gear oil.. After I wiped it down and drove it for a few days it was back but dripping down on the sides.. Which led me to believe it was coming from the top of the transmission so I checked my shifter and there's a ton of gear oil leaking from it.

The last owner of the car bought one of those shitty Chinese 40$ short shifters, the one right here . It looks like when they installed it they didn't secure the shift boot onto the shifter housing I also noticed upon taking it apart I noticed it doesn't have any sort of gasket or anything.

On the Nismo shifter I think I see a gasket or two that should be used?

Is the shifter supposed to have a gasket inside of the shift housing or is it just the shift boot that is supposed to hold in the gear oil with no gaskets?

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lots of ways this can go wrong, primarily because the shifter goes into the transfer case, not the gearbox.

So, transfer case could have 4l of gear oil in it (not good for it, and likely to cause plenty of splashing).

Yes, the shifter boot is the primary thing keeping the transfer case oil in, secure it with a big cable tie. There should be a gasket between the housing and shift housing but that is much less likely to be a source of leak, and can just be silicone if you don't have a gasket handy.

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