Alrighty....so I've been fed up with going down the highway in top gear at 3500 rpms going around 70mph. I tried looking at getting a AWD 6 spd transmission, but the setup is completely different--unfortunately. My differential ratio for my manual 5sp X5 is 4.10s. And with no real "over-drive" top-gear, the only thing I can do is change the front&rear diffs.

I did not see any good write-up for 3.0 E53s changing front diffs. And I did not want to drop my subframe like TIS suggested neither. All I could find with VAST google search's is that, yes you can squeeze the front diff out of the car barely.

So off to changing my front diff first!

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6