Hi all,
I have come to the conclusion my gearbox is f****d!
It whines like crazy in most gears and i think it could be part of the cause of my grating through gears and general vibration etc.
Now im unsure if it has LSD or not - iv been told if i spin a wheel then the other should follow suit. Mine does sod all

Is there another way i can find out if it is or not? as i dont want to bother rebuilding it if its not.
Also how hard is it to rebuild for someone who is relativly handy with the spanners? Are any special tools needed etc?
And lastly would a whining noise (that dissapears when clutch pedal is depressed) indicate bearings, cogs, both or something totally different?

Any help greatly appreciated