I changed the oil on a high mileage 'box which incorrectly had EP90 in it. I bothered to buy a good quality oil - Redline ATF from the US - and it transformed how the gearbox performed. Not sure that this is going to resolve your clunk, but if you are looking to overhaul the driveline, then this is worth doing...
I've just replaced the centre bearing and rubber doughnut - the doughnut is remarkably insubstantial - even a new one! Bear in mind that all it does is to centre the prop which if balanced and with couplings in good condition should need only minimal centering
Good luck with it all
|