Rb25 Neo Gearbox Clunk?

[Loui34]

Hi all, recently just bought my first japanese car being a 1998 R34 GT-T with a manual transmission. Over the last few weeks i've noticed a slight clunk sound when I change gears. At first I thought it could have been from my driving and clutch release but after being extremely careful through my gear changes the clunking sound has continued....I noticed the sound to be loudest from first to second gear change and quiter from second to third. Any ideas what it could be or has the gearbox just had its time and in need of a change??

thanks

[The Dan]

Is it a clunk or a crunch?

[Loui34]

Defiantly a clunk. Im sure to have the clutch completely in when changing gears. It sounds like a thud coming from underneath the back seats area. I haven't been releasing the clutch too early either. any ideas???

[The Dan]

Sounds like the tailshaft centre bearing could be loose or worn out. Fairly unusual to be worn out on a Skyline that age so check to make sure it's not loose. Pretty much the middle of the car there is a joint there. Grab the tailshaft and push up and down. You should get some movement in the rubber but you shouldn't be able to bash it around like a parson's prick in a sugar bag.

It could also be the diff mounts or excessive backlash in the diff itself. Get it checked by a professional if you aren't sure. Most should at least check it free of charge

[GTSBoy]

What he ^ said. Rear CVs can also contribute. Even rear subframe and diff bushes can contribute (but not as much and I wouldn't expect to hear it is a clunk on gear changes).

[Loui34]

great, thats exactly what i needed to know, thanks for the help

im probably going to get a specialist to go over the car on the weekend after hearing this lol