you don't have to just loosen the mount's a little and it will pivot nicely.
The only thing is doing this will increase (slightly) the angles in your rear drive line marginaly and could cause them to show wear quicker (reduces the front tho).
but this is quicker based on a factory one that foes 200,000km or more
and if really worried some camber wedges to lift the pinion about 5 deg would help.
If I had a body lift I would be doing this to get a flat belly but my lift will be all in th springs (they are on the floor at the moment)
the engine does not have the same clearance issues and the torque load etc will still be on the same points so no worries.
Also chat to Steve he will tell you what you can do for the drive line.
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