93 240sx 5sp Transmission clunk/grind when shifting into reverse

[zer0c123]

For several months now, whenever i clutch in and shift into reverse the whole car suddenly shakes real quick with a thump sound ( the quick shaking feels like an automatic transmission when you shift from N to R. I've done some testing making sure that the clutch is pressed down all the way

- the clunk sound seems to occur whenever i clutch in and immediately shift into reverse fast.

-if i clutch in and immedialely put the shifter to the right and slowly pull the shifter down to reverse, the shifter tends to vibrate/ grind on something.

I have to clutch in and slowly and just casually or slowly get the shifter into reverse to avoid any of the above. After reading other posts i thought maybe the problem was the shifter bushing, so i took the shifter out and the bushing was still intact. The image of the shifter is below.

I also changed the transmission oil to redline mt90 gl-4 couple of months ago, but the problem was still there before i changed the transmission oil.

The car has 117k miles on it, and i'm pretty sure it has the original factory clutch on it.

[s13sr20chris]

try bleeding the clutch slave cylinder. it sounds like air in the system or a failing slave cyl.