Front and Rear Diff

[x5e53]

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?

[Steamyrotter]

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

[X5Sport]

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

[x5e53]

OK.

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