hmmmm .... yep and hopefully when you are on the gas it will lift the pinion gear to be pointing up more towards the box output shaft ..... but you said it was under more of a "cruise" situation yeah ?? in that case i'd give it a go with the washers at the front to and see if it changes the vibration gettin confused now ... but if the tailshaft bloke reckons to lift the box then droping the pinion should achieve the same ??