Grinding sound from gearbox when changing gear

[gort]

Hi Guys.

 

The gearbox grinds when changing from 4th to 5th at speed, if I am driving normal it doesn't do it and goes into gear really easy but as soon as I am doing a bit of speed and at high revs it grinds, does anybody have any idea what could be causing this?

 

Thanks in advance.

 

 

Edited December 6, 2019 by gort

[ZMANALEX]

Clutch not clearing or you are beating the 4th-5th syncro.

 

Either way the gearbox will have to come out if you want a permanent fix or just let the revs drop  and be a tad less aggressive with your gear changes.

[gort]

 could it be a worn synchro ring on 4th ?

and would new oil + molyslip help

[ZMANALEX]

28 minutes ago, gort said:

 could it be a worn synchro ring on 4th ?

and would new oil + molyslip help

That is what I basically have said regarding the syncros.

Fresh fluids will not help.

Just be less aggressive with your gear changes and you will be fine.

Or splash the cash and pull the box.

[gort]

38 minutes ago, ZMANALEX said:

That is what I basically have said regarding the syncros.

Fresh fluids will not help.

Just be less aggressive with your gear changes and you will be fine.

Or splash the cash and pull the box.

thanks (y)

[gort]

Any idea of the total cost?, Would I need to buy the parts from Nissan