Just finished putting the car back together and have a problem with the gearbox, there is a hole directley under the exhaust elbow and I have no idea what gos in there, it needs sorting as it pisses oil out every where. This box has a code of JB3S something something. The other gearbox I have does not have this hole and has a diffrent code on the tag JB3 000? Anyone able to shead any light on this?