R33 Gearbox Issue List - Do I Need A Rebuild

[SargeRX8]

Hey all,

I know my gearbox needs a couple of things done to it but I thought I should list the things I know are wrong with it and people could help tell me what the causes and solutions would be. In no real order, these are the issues:

When reversing or in first gear and say getting into a parking spot, I clutch in then slowly out, start moving, then clutch in. At this point I get a loud clunk from the box. I was told the clutch or something else could be warped or not fitted flush.

When the clutch is depressed(off the clutch), I get a whirring sound. Regardless if its in gear, neutral or moving.

Sometimes when I go to stop I will clutch in, put it in neutral, stop then release the clutch. When I release the clutch I sometimes get a deep thud sound.

If I drive faster than say 140km in 5th gear then try to downshift into 4th, the gear wont go in. It grinds HARD. It literally feels like I didnt press the clutch. I gotta back off the clutch and then clutch in again and it goes in.

Anyone know the causes to these problems? The most annoying are the first and last. I dont like grinding gears and I dont like a noisy clunky box.

Anyone know any reputable specialists in Sydney and estimated costs for this kind of job?

[33mspec97]

im no skyline expert, only having owned mine for 3 weeks, but i am a mechanic by trade n have had a lil to do with clutches. sounds to me like either ur release bearing is flogged out, and/or basically your clutch is plain rooted.

check g/box oil, see what its like. usually a good starting point. oil will normally give u an idea as to what kind of nick the gearbox is in. but the whirring sound your getting when your takin your foot off the clutch makes me think either worn clutch plate or a failed spigot bearing.