Gearbox grinding sounds

[futurezedowner]

My gearbox is making a very unpleasant grinding sound whenever I change into 6th at any speed above about 55mph. I'm pretty sure the synchromesh is going/gone but the next step is not really clear to me. I see three options:

 

1. Change the gearbox oil in the hopes that I can buy myself some more time

2. Pay for an expensive repair on the gearbox

3. Find a second hand gearbox from somewhere and get that fitted

 

Has anyone else had a similar problem, if so, what gearbox fluid should I buy? And if that's not going to work how much do you think the repair options are going to cost?

I live in Kent and my zed has 38k miles.

 

Any help very much appreciated!

[Willsy1980]

I'd start with a fluid change and some molyslip. Seems to be a decent option to try before a new box. 

@Ewen@Clark Motorsport is just one of the traders on here who will be able to supply everything you need fluid wise.

@ZMANALEX will probably be able to help secondhand box wise 

[ZMANALEX]

Gearbox internals are in stock.

Fully tested and fully working low mileage pre-owned gearboxes are also in stock.

Just drop me a PM if I can help further.