I've got a RB26/30 and got around 540hp AWD.
Last night as I was changing my gears and went from first to second, it didn't let it into second gear very well and then I tried again and as I did this it went in but I just hear the worse noises possible. I came to a stop around 200m's later (I had to find a safe place to pull over) and turned the car off, let it sit there for a few minutes. I proceeded to start the car and same noises happened.
Called RACQ and while I waited for the tow truck (this would be 30 minutes after making the call) I started it again and the noise wasn't there, put it into first gear and drove probably less then 2m and the noises started again.
Got the car towed home and tried to roll it into the shed, start turning the wheel to turn into the car port and couldn't push any further, was pretty heavy.
Started the car, no noises and quickly placed it into first and drove it into the car port and just as I came to a stop, the noises started again but I quickly turned off the engine.
So I'm wondering what this could possibly be.
I had feared it might of been bottom end however, starting the engine twice and not hearing the noise until I placed it into first gear and moving the car forward, I got my doubts it could be this.