Originally Posted by DaveEscos
Wes, the car has ford spec oil in the diffs and transfer, but some quiafe reccomended oil in the box.. i shall find out but i dont think thats the prob
Thats your problem i reckon, as Quaife sell Silkolene Syn5, they recommend it, it's not what you should use in your gearbox, trust me, been there done that with that oil in an MT75! Don't get me wrong, it's good oil, just not suited to the MT75 with syncros.
The crunching will be because the oil is too slippery, the syncros can't slow down fast enough, syncros go CRUNCH!
Goto Ford and buy 2 litres of their MT75 oil, job done, if you haven't mullered the syncros already.