XSeries-forum

Are all e53 front and rear diffs interchangeable between engines?
Which diff (from which engine model) would give the fastest acceleration?
Would it be the 3.0i petrol?

All depends what you are starting with....

They are the same casings but different internals ASAIK.

You may gain in accelleration, but lose in top speed / revs at cruising speed.
The other side is that you will then change the stresses on the other components and potentially screw up the speedo calibrations

.....and break the transfer or gear boxes...

OK.

Thought 3.91 to 4.10 would not have been that much of an increase.
But best to stick on the safe side.