slave cylinder and gearbox question

[V-Spec]

i have an r31 aus spec manual

all forward gears and reverse work fine

but when in reverse having the gear being engaged and the clutch it makes sort of a grinding noise not to harsh but its there you can just hear it better when rolling back with clutch in and reverse engaged

wtf is this, gears go in smooth as

also slave cylinder question for my gearbox, the boot has come off and its become a bit rough sometimes when pushing the clutch in down the bottom, i got someone to press clutch in and out, hoped under the car found the slave cylinder boot is ****ed cylinder part is squeking, then doused thw whole thing with wd40, didnt seem to do much initally but then became smooth again

now when im stationary the clutch goes in fine but even in neurtal or in any gear, well easyer to test in neutral, rev the car a little bit and hold it then pull the clutch out and in (you can se why its better in neurtal) and if becomes rough with revs again but smooth when not reving the engine like you can feel the revs through the clutch, feels like its the slave cylinder again but havnt got 2 people and checked it out

wtf is wrong here

[Jax]

The reverse noise you describe, if I understand you properly, I think is quite normal. Try it in someone else's car [any sort] and see if you get similar feel and sound. Second symptom appears maybe to be clutch thrust bearing, but may not be a disaster. Not a good idea to rev engine with clutch pedal down. Thrust bearings are not 'high-speed' bearings, being primarilly designed to operate at around idle revs. When clutch pedal down, thrust bearing does engine revs.

[V-Spec]

thanks for feedback, i though the reverse thing was normal

have to get that looked at

how hard are clutch barings to replace