Correct amount of oil for seven gearbox

[Colin Morgan]

Just my experience, but when I put my Ruby back on the road twenty years ago I soon suffered clutch slip (usually in top when it is transmitting the most torque, of course).  On taking the box out, found that the Borg & Beck clutch plate was black and shiny (glassy) with oil.  Changed it for a good used one.  Within a few thousand miles had clutch slip again.  Burned the oil off using friction by propping the car against a kerb.  But the slipping returned after a while.  Then I heard about dropping the oil level in the box so syringed about half an inch out - not had clutch slip since.  

Colin