Gtr Drivetrain Issue

[breaker1845]

Hi Guys,

I have been having some issues with my drive train in the r33 gtr. Not entirely sure how to fix the issue, hence the thread creation. I've tried searching what I can but can't seem to find a problem similar to mine.

This issue specifically happens only in reverse. I have no issues selecting gears or changing gears, the gearbox runs perfect except when I am trying to reverse (gear already selected) it feels as if the car has no power and struggles to move backwards.

After reversing I re-engage my clutch to select a gear and I can hear a massive 'clunk' type noise which is quite loud and could be heard from outside the car a few meters. The noise definitely sounds like it is coming from the gearbox and transfer case region but my ears could be lying to me as the noise is quite loud.

I haven't ever heard the noise between gears but it may have happened while in neutral and selecting first. The link between the two would be that the car is stationary.

Could there be an internal problem within the gearbox causing the lack of power delivery? It wouldn't be the selector fork as I would have issues selecting gears.

I have thought of the drive shafts being an issue or the differentials and I plan on checking the joints when I have the car on jack stands in a few days.

Final thought is that the transfer case could be a problem, hoping it is.

Looking to see if anyone has any ideas of what the problem might be or similar issues as I don't want to particularly pull the entire drive train out for fun.

Cheers.

[GTSBoy]

There's not only one selector fork in a gearbox. There's one for every plane in the box. So you can break one and not be able to select, say, 5th and reverse, or 1st and 2nd. And maybe you could break one in such a way that you can select one of the gears in a plane but not the other. So it is possible that you have done something to a selector.

But there are a dozen other things that could be wrong. It's box out time if you ask me. Internet diagnosis is not going to be easy on this one.

[jiffo]

You need to give a lot more info but it does sound that perhaps the box is still in mesh with the previous gear and has then also selected reverse.

Interlocks normally stop this from happening.