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HI All, I've just bought an old X3 Auto 2.5i petrol 2004 and its great but there is an odd jolt as the car excellarates through the lower gears and back down when breaking. Its now becoming quite annoying. I've looked round for advice on internet but not sure what to do. Some have mentioned making sure wheels are identical but not sure how that can effect the gears going up and down? COuld be software? Confused of Croydon!
Pleae help :) Thank you
 

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Odd tyres tread wise will wind the diff's up and they will fail badly in the end.
Also you could get the auto box serviced that might be the problem.
Do a search for diff wind-up.
 
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