I have a 1200 ute that's almost finished with an a15, h150 and a 120y tailshaft. The tailshaft is a pretty snug fit. Probably only 1 or 2mm play. I took it for a drive up the street for the first time and when I got back I noticed a small patch of oil which was leaking out the back of the rear gearbox seal. I've had this same setup in another car before but not sur if the other tailshaft was shortened before I had brought it. I always thought u should have at least 10mm play. Could this b the problem. Do u normally have to shorten the 120y tailshaft with this set up??