Ok after racking both my brain and a few of my mates I have finally come to a point where I have no idea where to go from to fix my gearbox problem...
I first got my car from Japan with a farely rough gearbox, I could not straight away change gears, I would need to shift slowly (let the gear disengauge and then change) it also felt like it needed to have the bearings done...
After looking around for a while a bought another RB20DET box and a new Exedy HD clutch kit.
After installing the new box and clutch it became impossible to put it into gear. Even after bleeding the clutch it still wouldnt pull far enough out that it would go into gear.
Next I decided to change the clutch slave cylinder. After buying a new cylinder and installing it when we went to bleed the clutch again I found that the slave cylinder was going past its max point of travel and shooting the lug out of the slave cylinder.
With my car now stuck in the middle of my mates workshop we turned back to the original slave cylinder, I figured that it was not pushing the pinion all/far enough out so I got a hardened steel rod and mad a longer pin to go in the end of the slave cylinder, re-bled the clutch and it worked really well!
After a week or two of driving it has returned to a similar or worse point then it was before.
Now if I jump straight onto the clutch very quickly or try a to double clutch and side step the clutch it makes a loud grinding noise and it seems like it is stuck between gears, the car then needs to be turned of then back on again to resolve it.
Anyway if you have had this problem or have any ideas please let me know!
Thanks Heaps!