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Gearbox Or Clutch Issue?

Slattery Gts-t
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Slattery Gts-t Contributor

Slattery Gts-t

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I have a really annoying problem with my r33 gts-t here's whats been done recently and what the issue is

If i shift into 2nd from 3000RPM to redline it crunches/grinds

If i shift to quickly from 2nd to 3rd it crunches/grinds (i need to go from 2nd to neutral then to 3rd to stop it)

Now heres the strange thing, If im cruising along say in 4th at 4000RPM then put my foot on the clutch and rev the car it makes a horrible grinding sound like the gears arnt engaged properly, it will only make this horrible sound while the engine is spinning at 3500-4000RPM or more and i press the clutch and rev it

If its in 4th at 4000RPM and i let the car slow down enough so when i release the clutch it should be doing 2500RPM then rev it with the clutch pressed it doesnt happen.

So in other words in any gear if the engine and gearbox input shaft are spinning at 4000RPM then i press the clutch and rev it i get this horrible sound (the pitch of the noise changes with revs)

These problems only started happening after i replaced the engine and clutch with an exedy HD clutch, turns out the engine i brought must have been an auto (had a flex plate bolted to it) I had no problems before i replaced the engine and clutch,

Today i pulled the gearbox out hoping to see some sign of this horrible grinding sound but everything looked fine, i lubed up the fork pivot realigned the clutch replaced the throw out bearing and replacing the gearbox oil with a semi syn 75w/90 grade oil. I did notice a little up/down play in the input shaft and some slight forwards/backwards play

The clutch starts grabbing half way up the pedal travel so it certainly seems to be disengaging properly

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https://www.sau.com.au/forums/topic/393616-gearbox-or-clutch-issue/
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Slattery Gts-t Contributor

Slattery Gts-t

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Well, after a little more research/searching iv narrowed it down to being the fact that i havnt put a manual spigot bush in pinch.gif

Iv done just over 1000kms without one in i hope the input shaft bearing is still ok

Slattery Gts-t Contributor

Slattery Gts-t

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To all those who may care,

The symptoms i explained in my first post were all caused by having no spigot bush, i now have one installed and all is good back to the way it should be no more crunching or horrible noises

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