Yep, I finally repaired my Gearbox in my Datto.
Thanks alot to all the guy's advice given, especially GXMAN

Just a recap,
The box was taken apart to replace the reverse gear that was damaged.
Wasnt releasing clutch fully, but once dropped out and reffited again, she works fine now,
however,
theres a slight noise whilst idling, and when I press in the clutch, the noise dissapears,
I do know that this is the releleaser bearing noise.
What I'd like to know, is that,
would this noise dissapear with time, cause this is a new release bearing thats fitted on?