On my LT77 install I checked the flange angles with the engine/gearbox and diff set where I thought it would finish up, and the angle between them was < 2d...BUT the final rear gearbox mount install almost certainly changed that a little. Proof being in the pudding, so far up to ~ 110kph I have not experienced ANY vibration, just a fine inaudible vibration can be felt on the gear lever. All the diff mounting rubbers are NEW - the nearside diff bracket rubber was well shot and sagging, while the offside looked as good as new.