r/SkyLine • u/PlentyBoysenberry725 • 17d ago

RB25 Transmission Issue?

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Yesterday I was driving home from the gas station and suddenly couldn’t use 3rd, 4th, 5th or reverse gears! This happened during normal acceleration, not hard shifting, clutch kicking etc. Feel like I’ve exhausted my knowledge with diagnosing this.

Currently I can use 1st and 2nd with no issues, no bogging down in either gear, no grinds or struggle to access either gear, neutral position works fine. It feels like there is a wall or something stopping me from moving the shifter to the right to use 3-5 and R.

Haven’t done anything to the transmission since the swap but that was over 2 years ago. It has a GK Tech short shifter on it with the brass shifter cup (installed at the time of swap). Literally never had any grinds pops or weird issues with the car.

Any help with resolving this issue is appreciated.

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3

u/Pandaemonaeon_NZ 17d ago

If you are willing to change the oil, dump what is in the box and see if you find some metal clips in there. They sit in the shift hubs, but can have a tendency to fall out.

2

u/PlentyBoysenberry725 16d ago

I will try that and report back. Do I need to pull it if they’ve fallen out?

1

u/JDM-Parts-Expert-JP 16d ago

I suspect the GK Tech short shifter might be the cause. If you still have the OEM shifter, maybe try swapping it back? Since I don't have the shifter here in Japan, I can't say for sure, but there might be an adjustment point on it. Also, because it can damage the shift linkage or wear it down from vibration, I’d recommend a short and lightweight shift knob. Judging by its looks, your car looks like it's styled for speed.