Ok, an Xj with 31's on stock rims will rub the inside of the rear tyres on the wheel well, now with your rims having a 3.75" BS with the narrower diff your effective BS is 4.5" which is 0.75" more when compared to stock when flexing.
Now if you run 33x12.5's your tyres will rub more then stock rims with 31's and if you go 35's it will hardly flex at all relatively speaking....
The narrower rear diff will cause you issues....
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JJ
Do it once, Do it right!
2014 WK2 Overland
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