dont bother with redline or any of that, i put it in my 34 gearbox to temporarily resolve a crunching 2nd syncro. 3 months later the syncro is completely destroyed and either the input shaft bearing or the other main bearing has gone as well. as has been said a rebuild is the better way to do it, i should have rebuilt mine first up. if thats not to your liking then just take it easy, rev match downshifts etc.